Brands we can’t read yet

We only read a serial number when the maker explains its date code, or when at least two independent guides agree and show worked examples. These brands don’t meet that bar yet. For any of them, look on the label for a printed manufacture date.

• 2GIG Security & alarmsWe found nothing from 2GIG or elsewhere that says how its serial holds a date.
• ADT Security & alarmsADT panels are made by other companies, so one serial rule can't cover them.
• AirTemp Heating, Air conditioningAirTemp's format changed by era, and the guides we found disagree or cover only one period.
• Allied Heating, Air conditioningOnly one guide describes this brand's format, and we need two that agree or the maker's own.
• Alside Windows & doorsWe found no maker page or independent guide that explains a date code on Alside windows.
• Amarr Garage doorWe found no maker page or guide that explains an Amarr serial or date code.
• Amerex fire extinguisherAmerex hasn't published a way to read a date from its serial, so look for the date stamped on the cylinder.
• American Appliance Water heaterThe date isn't in the serial; it's in a separate warranty code.
• Ameristar Heating, Air conditioningOnly one guide describes this brand's format, and we need two that agree or the maker's own.
• Amtrol Water heater, WellWe couldn't confirm a published date rule for Amtrol water heaters.
• Andersen Windows & doorsAndersen etches the build quarter and year in the glass corner, like 1-06, and labels carry a date since 2007. Look for the printed date.
• APEC Reverse osmosis water filterAPEC hasn't published how to read its serial numbers, and we found no guide that does.
• Apollo Water heaterNo source names who makes Apollo, so we can't say which maker's date rule applies.
• AprilAire DehumidifierAprilAire hasn't published a date code; ask your installer for the install date.
• Aquasana Reverse osmosis water filterAquasana hasn't published how to read its serial numbers, and we found no guide that does.
• Aquazone Heating, Air conditioningOnly one guide describes this brand's format, and we need two that agree or the maker's own.
• Argo BoilerThe guides we found disagree with each other and with the maker's chart on how to read these serials.
• Ariston Water heaterOnly one reference site gives Ariston's serial rule, and we need two that agree or the maker's own.
• Armor Water heater, BoilerThe guides we found disagree on how to read Lochinvar's serial, and its newest numbers have no published decoder.
• Asko DishwasherAsko prints the build date on the name plate in the door, so there is nothing to decode.
• Asus Internet & Wi-FiWe found no maker page that gives a date in these routers' serial numbers, so we can't read them.
• Atlas Roof & guttersShingle makers print a date only on the bundle wrapper, which is thrown away, so nothing on your installed roof shows its age.
• Avanti RefrigeratorWe found no document that describes how Avanti codes the date.
• B-hyve SprinklersOrbit hasn't published a date code, and we found no guide that explains its serial numbers.
• Basement Watchdog Sump pumpBasement Watchdog hasn't published a date code, and we found no guide that explains one.
• Beko RefrigeratorBeko only says where the label is, and the one date hint we found covers old UK fridges only.
• Biasi BoilerOnly one guide describes this brand's format, and we need two that agree or the maker's own.
• Bio Bidet BathroomsBio Bidet hasn't published a date code, and we found no guide.
• Blomberg DishwasherBlomberg is a Beko brand and publishes no date code of its own.
• Bock Water heaterThe guides give a year-and-month code, but no maker page confirms it and the years it covers are unclear.
• Borg-Warner Heating, Air conditioningOnly one guide describes this brand's format, and we need two that agree or the maker's own.
• Brinks Security & alarmsBrinks equipment is made by other companies, so one serial rule can't cover it.
• BRK Smoke & CO detectorsBRK says the date on the back of the alarm is the manufacture date, so there is nothing to decode.
• Brondell BathroomsBrondell hasn't published a date code, and we found no guide.
• Bryan BoilerThis maker prints the build date on the label, so there's nothing to decode.
• Buckeye fire extinguisherWe found no published guide to dating a Buckeye extinguisher, so look at the stamp on the cylinder.
• Buderus Boiler, Water heaterBuderus hides the date in a year digit and day count, and we couldn't confirm the rule from the maker itself.
• Bullfrog Pool & spaBullfrog hasn't published how to read a build date from its serial, only where to find the label.
• Burnham BoilerThis maker prints the build date on the label, so there's nothing to decode.
• Cadet HeatingWe couldn't find a published date code for this maker.
• Cal Spas Pool & spaWe found no maker page or guide that explains Cal Spas serial numbers.
• Century Heating, Air conditioningThis label was built by several makers, and the serial doesn't say which.
• CertainTeed Roof & guttersShingle makers print a date only on the bundle wrapper, which is thrown away, so nothing on your installed roof shows its age.
• Challenger ElectricalChallenger hasn't published a date code, and we found no guide that explains one.
• Chamberlain Garage doorChamberlain's support page says the opener's label lists a manufacturing date, and no maker or guide decodes the serial. Look for the printed date.
• Champion Heating, Air conditioning, GeneratorOnly one guide describes Champion's furnace format, and its generator rule covers only engines built before 2011.
• ChargePoint EV chargerChargePoint hasn't published how to read a date from its charger serial numbers.
• ClimateMaster Heating, Air conditioning, Heat pumpOnly one guide describes this brand's format, and we need two that agree or the maker's own.
• Clopay Garage doorOnly one guide describes Clopay's serial, and it covers the plant, not the date.
• Columbia BoilerColumbia prints the year built on the rating plate, so there's nothing to decode.
• Comfort-Aire Heating, Air conditioningThis label was built by several makers, and the serial doesn't say which.
• Copper-Fin Water heater, BoilerThe guides we found disagree on how to read Lochinvar's serial, and its newest numbers have no published decoder.
• Cosmo Range & ovenWe found no document that describes how Cosmo codes its serial numbers.
• Cove DishwasherCove prints the build date on the serial tag, so there's nothing to decode.
• Craftsman Garage doorChamberlain builds these openers, but we found no maker page or second guide on where or how the date is printed.
• Crest Water heater, BoilerThe guides we found disagree on how to read Lochinvar's serial, and its newest numbers have no published decoder.
• Crosley RefrigeratorOnly one guide describes it, and we need two that agree or the maker's own.
• Crown BoilerOnly one guide describes Crown's format, and we need two that agree or the maker's own.
• Culligan Water softener, Reverse osmosis water filterCulligan hasn't published how to read its serial numbers, and a dealer is the only route we found.
• Cummins GeneratorCummins tells owners to call it with the serial; the only decoding we found was one forum post.
• Cutler-Hammer ElectricalCutler-Hammer is Eaton's older name, and Eaton explains its date code for only one breaker line and one year.
• D.W. Whitehead Water heaterOnly one guide describes Vaughn's format, and we need two that agree or the maker's own.
• Dacor Range & ovenOnly one guide describes it, and we need two that agree or the maker's own.
• Daikin Air conditioning, Heat pump, HeatingOnly one guide says Daikin follows Goodman's format, and we need two that agree or the maker's own.
• Danby Dehumidifier, RefrigeratorGree-made units print a date code on the sticker as month and year, like 01/07.
• Dayton Heating, Air conditioningDayton is a store label, and we couldn't confirm which maker's date rule applies to it.
• Dettson Heating, Air conditioningOnly one guide describes this brand's format, and we need two that agree or the maker's own.
• DSC Security & alarmsDSC offers a date code lookup tool but hasn't published the code, so we can't read it.
• DuroMax GeneratorWe couldn't find a published way to read the build date on a DuroMax generator.
• Eaton ElectricalEaton explains a printed date code for only one breaker line and one year, so we can't apply it more widely yet.
• ecobee HeatingWe couldn't find any published date code for this thermostat.
• EcoSmart Water heaterThis brand numbers its heaters in sequence, so the serial doesn't contain a manufacture date.
• EcoWater Water softenerEcoWater hasn't published how to read its serial numbers, and we found no guide that does.
• EdgeStar KitchenNo maker or guide gives a date code, though many labels print the date.
• Eemax Water heaterThis brand numbers its heaters in sequence, so the serial doesn't contain a manufacture date.
• eero Internet & Wi-FiWe found no maker page that gives a date in these routers' serial numbers, so we can't read them.
• Electrolux Refrigerator, Dishwasher, Washer, Dryer, Range & ovenOnly one guide covers Electrolux's US serials, and the maker's own page describes the European format.
• Empire HeatingWe found no published rule for reading this brand's serial number.
• Emporia EV chargerEmporia hasn't published how to read a date from its charger serial numbers.
• Energy Kinetics BoilerOnly one guide describes Energy Kinetics's format, and we need two that agree or the maker's own.
• Energy Saver Water heater, BoilerThe guides we found disagree on how to read Lochinvar's serial, and its newest numbers have no published decoder.
• Enphase SolarEnphase hasn't published how its serial numbers show a date, and no guide we found agrees on one.
• Evcon Heating, Air conditioningThe guides we found disagree on how to read this brand's serial number.
• Everbilt Sump pumpWe couldn't find a published way to read the date on an Everbilt pump.
• Everhot Water heaterWe found no published rule for reading this brand's serial number.
• Fantech Ventilation, radon fanWe couldn't find a published date code for this maker.
• Fedders Heating, Air conditioningThe guides we found disagree on how to read this brand's serial number.
• Federal Pacific ElectricalWe couldn't find any published way to read the date code on Federal Pacific panels or breakers.
• Festa radon fanWe found nothing that says how a Festa fan serial holds a date.
• Firebird BoilerOnly one guide describes this brand's format, and we need two that agree or the maker's own.
• Firex Smoke & CO detectorsFirex alarms are sold by Kidde and print the manufacture date on the back label; look for it there.
• First Alert Smoke & CO detectors, fire extinguisherFirst Alert prints the manufacture date on the back or side label of the alarm. Replace it 10 years after that date.
• Fisher & Paykel Refrigerator, Dishwasher, Washer, DryerOnly one guide describes Fisher & Paykel's format, and we need two that agree or the maker's own.
• Fleck Water softenerFleck makes the valve, not the whole softener, and hasn't published a date code we could find.
• Flexcon WellFlexcon says its warranty runs from the manufacture date, but we found no guide to reading it from the tank.
• Flint & Walling WellFlint & Walling hasn't published a date code, and we found no guide that explains its serial numbers.
• Flotec Sump pumpWe couldn't find a published way to read the date on a Flotec pump.
• Fluidra Pool & spaThe only guide puts its date rule in pictures we couldn't verify, and other sites disagree on year-and-week versus letters.
• Franklin Electric WellFranklin Electric hasn't published its motor date code, and we found no guide that explains it.
• FranklinWH SolarFranklinWH hasn't published how to read a date from its serial number.
• Friedrich Air conditioningFriedrich's published code is for 2003-era units, and later models were built by other makers with different formats.
• Fronius SolarFronius hasn't published how to read a date from its serial number, and we found no guide.
• Fujitsu Air conditioning, Heat pumpWe found no rule for Fujitsu's serial, and guides say it may not hold the date at all.
• GAF Roof & guttersShingle makers print a date only on the bundle wrapper, which is thrown away, so nothing on your installed roof shows its age.
• Gaggenau Dishwasher, Range & oven, Refrigerator, Washer, DryerThe guides we found disagree on how to read the FD number, and the maker hasn't published a rule.
• Generac GeneratorGenerac prints the manufacture date on the data tag, labeled PROD DATE or MANUFACTURING DATE, as year, month, day.
• Generac PWRcell SolarGenerac doesn't publish a date rule for its PWRcell batteries and inverters, only for its generators.
• Genie Garage doorGenie hasn't published a serial rule, and the guides we found each read the first digits differently.
• Giant Water heaterGiant prints the date on the tank label, not in the serial, so there's nothing to decode.
• Golden Knight Water heater, BoilerThe guides we found disagree on how to read Lochinvar's serial, and its newest numbers have no published decoder.
• Google Nest Protect Smoke & CO detectorsGoogle says to replace it 10 years after manufacture but hasn't published how its serial holds a date; the app shows the expiry.
• Google Nest Wifi Internet & Wi-FiWe found no maker page that gives a date in these routers' serial numbers, so we can't read them.
• Goulds Septic, WellGoulds hasn't published a date rule, and newer pumps keep the build date in a scannable code on the label.
• Gree Air conditioning, Heat pumpGree prints the year and month on the data plate, so there's nothing to decode.
• Grizzl-E EV chargerGrizzl-E's maker hasn't published how to read a date from its serial numbers.
• Grundfos WellGrundfos prints a year-and-week production code, but we only found its manual for industrial pumps, and the layout wasn't clear.
• H.B. Smith BoilerThe age can't be read from these boilers' serials, and we found no published rule.
• Haier Refrigerator, Washer, Dryer, Air conditioningOnly one guide describes Haier's format, and we need two that agree or the maker's own.
• Hamilton Beach MicrowaveWe found no maker document or guide that explains Hamilton Beach serial numbers.
• Harman FireplaceHarman hasn't published a date code; older stoves show a test date, newer ones a build date.
• Harvey Windows & doorsWe found no maker page or independent guide that explains a date code on Harvey windows.
• Hearthstone FireplaceWe couldn't find a published date code for this maker.
• Heat & Glo FireplaceHearth & Home hasn't published how to read its serial numbers, and the guides we found are only forum guesses.
• Heat Controller Heating, Air conditioningThis label was built by several makers, and the serial doesn't say which.
• Heatcraft Heating, Air conditioningWe found no published rule for reading Heatcraft's serial number.
• Heatilator FireplaceHearth & Home hasn't published how to read its serial numbers, and the guides we found are only forum guesses.
• Hitachi Air conditioning, Heat pumpWe found no published rule for reading this brand's serial number.
• hOmeLabs DehumidifierWe couldn't find a published date code; check the label for a printed date.
• Honda GeneratorHonda hasn't published a way to read a build date from its generator serial numbers.
• Honeywell Heating, Security & alarmsHoneywell prints a four-digit date code on the back of the faceplate but doesn't say how to read it.
• Hot Spring Pool & spaHot Spring hasn't published how to read a build date from its serial, only where to find the label.
• Hoyt Water heaterWe found no published rule for reading this brand's serial number.
• HTP Boiler, Water heaterOnly one guide describes this maker's formats, and we need two that agree or the maker's own.
• Hunter SprinklersHunter prints a month-and-year date code on the back of each controller, but hasn't published how the digits are laid out.
• Hydrohot Water heaterOnly one guide describes Vaughn's format, and we need two that agree or the maker's own.
• HydroTherm BoilerWe found no published rule for reading this brand's serial number.
• IKO Roof & guttersShingle makers print a date only on the bundle wrapper, which is thrown away, so nothing on your installed roof shows its age.
• Insignia RefrigeratorBest Buy's Insignia brand publishes no serial format, and its makers vary by model.
• InSinkErator KitchenInSinkErator explains its date code, but no source shows a full serial, so we can't read it safely yet.
• Inter-City Heating, Air conditioningOnly one guide describes this brand's format, and we need two that agree or the maker's own.
• iSpring Reverse osmosis water filteriSpring hasn't published how to read its serial numbers, and we found no guide that does.
• Jacuzzi Pool & spaJacuzzi hasn't published how to read a build date from its serial, only where to find the plate.
• James Hardie SidingHardie stamps the back of each board, but no maker page or guide explains the date code, and it's hidden once installed.
• Jandy Pool & spaThe only guide puts its date rule in pictures we couldn't verify, and other sites disagree on year-and-week versus letters.
• JELD-WEN Windows & doorsJELD-WEN says a date is printed on the spacer between the panes. Each plant codes the rest differently, so just look for the date.
• Jotul FireplaceJotul doesn't publish a serial date code; owners are told to call a dealer.
• JuiceBox EV chargerEnel X's JuiceBox ID is an online identifier, and no date code is published.
• Kenmore Water heater, Heating, Air conditioning, Refrigerator, Dishwasher, Washer, Dryer, Range & oven, Microwave, DehumidifierKenmore products were built by several makers, and the serial doesn't say which.
• Kinetico Water softener, Reverse osmosis water filterKinetico hasn't published how to read its serial numbers, and we found no guide that does.
• Knight Water heater, BoilerThe guides we found disagree on how to read Lochinvar's serial, and its newest numbers have no published decoder.
• Kohler Generator, BathroomsKohler's label shows a date code but Kohler hasn't published how to read it.
• Kozy Heat FireplaceThe silver label by the gas valve prints the manufacture date, so there is nothing to decode.
• Laars Boiler, Water heaterThe guides we found disagree on which digits hold Laars's year.
• Leviton ElectricalLeviton hasn't published a date code for its panels or breakers, and we found no guide that does.
• Liberty Sump pumpLiberty says the nameplate code is the date of manufacture but doesn't publish its format.
• Liberty Pumps SepticLiberty hasn't published how to read its serial or code numbers, and we found no guide that does.
• Lifebreath VentilationOnly one guide describes it, and we need two that agree or the maker's own.
• LiftMaster Garage doorChamberlain's support page says the opener's label lists a manufacturing date, and no maker or guide decodes the serial. Look for the printed date.
• Linear Garage doorWe found no maker page or guide that explains a Linear opener serial or date code.
• Linksys Internet & Wi-FiWe found no maker page that gives a date in these routers' serial numbers, so we can't read them.
• Little Giant Sump pumpLittle Giant hasn't published how to read its serial or date codes, and we found no guide.
• Lochinvar Water heater, BoilerThe guides we found disagree on how to read Lochinvar's serial, and its newest numbers have no published decoder.
• Loewen Windows & doorsWe found no maker page or independent guide that explains a date code on Loewen windows.
• Lopi FireplaceTravis only publishes serial ranges for a few old pellet stoves, not a date code.
• Magic Chef Heating, Air conditioning, Range & ovenOnly one guide describes this brand's format, and we need two that agree or the maker's own.
• Majestic FireplaceOnly one maker notice describes it, and only for a few years of units, so we can't be sure it holds for yours.
• Manitowoc KitchenManitowoc only says where the serial plate is, not how to read a date from it.
• Marathon Water heaterThe guides only give made-up sample serials, and no maker page confirms the code.
• Marley HeatingOnly one guide describes it, and we need two that agree or the maker's own.
• Marvel KitchenNo maker or guide gives a date code, though many labels print the date.
• Marvin Windows & doorsMarvin's own serial is dated, but two guides explain its day number differently, giving March or June. We won't risk a wrong date.
• Master Flow Attic & insulationWe found no maker page or guide that explains a Master Flow date code, only a support phone number.
• Master Spas Pool & spaOnly one parts-store page says the first two digits are the year, and we need two that agree or the maker's own.
• Mendota FireplaceWe couldn't find a published date code for this maker.
• Mestek Boiler, HeatingWe found no published rule for reading this brand's serial number.
• MI Windows and Doors Windows & doorsWe found no maker page or independent guide that explains a date code on MI windows.
• Midea Air conditioning, Heat pump, Dehumidifier, RefrigeratorMidea's format rests on one guide and a forum post, and we need two solid sources or the maker's own.
• Miele Dishwasher, Washer, DryerMiele hasn't published a date code for its serial numbers.
• Milgard Windows & doorsMilgard's spacer number holds the build date, but no maker page or second guide explains how to read it.
• Mitsubishi Air conditioning, Heat pumpOnly one guide describes Mitsubishi's format, and we need two that agree or the maker's own.
• Modine Heating, Air conditioningOnly one guide describes this brand's format, and we need two that agree or the maker's own.
• Moen KitchenMoen hasn't published a date code for its disposals, and we found no guide.
• Moncrief Heating, Air conditioningOnly one guide describes this brand's format, and we need two that agree or the maker's own.
• Monessen FireplaceOnly one maker notice describes it, and only for a few years of units, so we can't be sure it holds for yours.
• Mor-Flo Water heaterThe date isn't in the serial; it's in a separate warranty code.
• Mortex Heating, Air conditioningOnly one guide describes this brand's format, and we need two that agree or the maker's own.
• Morton Water softenerMorton hasn't published how to read its softener serial numbers.
• Mr. Heater HeatingMr. Heater doesn't publish a date code we could find.
• MrCool Air conditioning, Heat pumpOnly one guide describes MrCool's formats, and it says its own information is unconfirmed.
• Munchkin Boiler, Water heaterOnly one guide describes this maker's formats, and we need two that agree or the maker's own.
• Murray ElectricalMurray panels use Siemens date codes, and Siemens hasn't published how to read them.
• Myers Sump pumpWe couldn't find a published way to read the date on a Myers pump.
• Napoleon Heating, FireplaceWe found no published rule for reading this brand's serial number.
• Nest HeatingNest doesn't put a date in its serial number; the Nest app shows when you installed it.
• Netgear Internet & Wi-FiWe found no maker page that gives a date in these routers' serial numbers, so we can't read them.
• New Yorker BoilerNew Yorker boilers use sequential serial numbers, so the serial has no date to read.
• Noritz Water heaterOnly one guide describes Noritz's format, and it never says what the digits mean.
• Norweco SepticNorweco tracks units by service card and hasn't published a date code, so we can't read the age from the serial.
• NTI Boiler, Water heaterOnly one guide describes this maker's formats, and we need two that agree or the maker's own.
• Olsen BoilerThe guides we found disagree with each other and with the maker's chart on how to read these serials.
• Orbit SprinklersOrbit hasn't published a date code, and we found no guide that explains its serial numbers.
• Overhead Door Garage doorWe found no maker page or guide that explains an Overhead Door serial or date code.
• Owens Corning Roof & guttersShingle makers print a date only on the bundle wrapper, which is thrown away, so nothing on your installed roof shows its age.
• Pacific Energy FireplaceWe couldn't find a published date code for this maker.
• Paloma Water heaterWe found no published rule for reading Paloma's serial number.
• Panasonic Air conditioning, Heat pump, Ventilation, MicrowaveOnly one guide describes Panasonic's format, and we need two that agree or the maker's own.
• Pella Windows & doorsPella's label and spacer print the build date in the string, written PELLA-MMDDYY. Look for that printed date.
• Pennco BoilerThe guides disagree on how to read Pennco's serial, and the maker couldn't confirm the year.
• Pentair Water softener, Pool & spaPentair, which owns Fleck, hasn't published a date code for its softener valves.
• Perlick KitchenNo maker or guide gives a date code, though many labels print the date.
• Phoenix Boiler, Water heaterOnly one guide describes this maker's formats, and we need two that agree or the maker's own.
• Pioneer Air conditioning, Heat pumpWe found no published rule for Pioneer's serial, and a sister brand's maker says the serial doesn't encode age.
• Ply Gem Windows & doorsWe found no guide for Ply Gem window date codes, only general advice to call the maker.
• Polaris Pool & spaWe found no maker page or guide that explains Polaris serial numbers.
• Power-Fin Water heater, BoilerThe guides we found disagree on how to read Lochinvar's serial, and its newest numbers have no published decoder.
• Purmo BoilerOnly one guide describes this brand's format, and we need two that agree or the maker's own.
• Qolsys Security & alarmsQolsys only describes a date code for one panel model, and gives no year table, so we can't read it.
• Quadra-Fire FireplaceHearth & Home hasn't published how to read its serial numbers, and the guides we found are only forum guesses.
• QuietCool Attic & insulationQuietCool shows the serial number but we found nothing explaining how to read a date from it.
• R.B.I. BoilerWe found no published rule for reading this brand's serial number.
• Rachio SprinklersOnly one Rachio support reply explains the first-generation serial, and newer models have no published rule.
• RadonAway radon fanRadonAway hasn't published how to read a date from its fan serial numbers, and we found no guide that does.
• RainSoft Water softenerRainSoft hasn't published how to read its serial numbers, and we found no guide that does.
• Raypak Boiler, Water heater, Pool & spaThe guides we found disagree on the order of the year and month digits.
• Red Lion WellRed Lion hasn't published a date code, and we found no guide that explains its serial numbers.
• Red T Heating, Air conditioningOnly one guide describes this brand's format, and we need two that agree or the maker's own.
• Regency FireplaceRegency shows where the serial number is but doesn't publish a date code.
• Renewal by Andersen Windows & doorsWe couldn't open the maker's guide for these, and the other pages we found don't give a date rule that two sources agree on.
• Republic Heating, Air conditioningOnly one guide describes this brand's format, and we need two that agree or the maker's own.
• Resco Heating, Air conditioningOnly one guide describes this brand's format, and we need two that agree or the maker's own.
• Resideo Security & alarmsThe date code is on the circuit board, and the same year letter was reused, so one code can mean two years.
• Revolv HeatingWe found no published rule for reading this brand's serial number.
• Reznor HeatingWe found no published rule for reading this brand's serial number.
• Ridgid Sump pumpWe couldn't find a published way to read the date on a Ridgid pump.
• Ring Smoke & CO detectorsWe couldn't find Ring's own guidance on where the date is printed; check the back label.
• Ring Alarm Security & alarmsRing hasn't published a date format for its alarm hardware, so we can't read it.
• Riva BoilerOnly one guide describes this brand's format, and we need two that agree or the maker's own.
• Ryobi Garage doorWe found no maker page or guide that explains a Ryobi opener serial or date code.
• Samsung Air conditioning, Heat pump, Refrigerator, Dishwasher, Washer, Dryer, Range & oven, Microwave, Audio & videoSamsung hasn't published its date code, and the guides we found disagree.
• Santa Fe DehumidifierSanta Fe doesn't publish a date code; the manual asks you to write down the install date.
• Sears Water heater, Heating, Air conditioning, Refrigerator, Dishwasher, Washer, Dryer, Range & oven, MicrowaveKenmore products were built by several makers, and the serial doesn't say which.
• Sensi HeatingWe couldn't find any published date code for this thermostat.
• Senville Air conditioning, Heat pumpSenville says its serial doesn't encode the age; the label points to a barcode for the production date.
• Sepco Water heaterOnly one guide describes Vaughn's format, and we need two that agree or the maker's own.
• Sharp MicrowaveSharp doesn't publish a date code for its microwaves, and we found no guide that explains one.
• Siemens ElectricalSiemens hasn't published how to read its date codes, and the codes we found changed between eras.
• Signature Kitchen Suite Range & ovenWe found no maker document or guide that describes its date code.
• Simonton Windows & doorsSimonton's sticker has an order number, but we found no page from the maker or anyone else that says how to read a date.
• SimpliSafe Security & alarmsSimpliSafe hasn't published a date format for its serials, so we can't read it.
• SJE Rhombus SepticSJE Rhombus hasn't published a serial or date code format, and we found no guide that explains one.
• Skylink Garage doorWe found no maker page or guide that explains a Skylink opener serial or date code.
• Slant/Fin BoilerSlant/Fin used sequential serial numbers that vary in format, so the serial can't give a date.
• SMA SolarSMA hasn't published a way to read the build date from its serial number, and we found no guide.
• Smeg RefrigeratorSmeg only says where the label is, and we found no guide that explains a date code.
• Smith Cast Iron Boilers BoilerThe age can't be read from these boilers' serials, and we found no published rule.
• Snyder General Heating, Air conditioningThe guides we found disagree on how to read this brand's serial number.
• SolarEdge SolarSolarEdge hasn't published how its serial numbers show a date, and we found no guide that does.
• Soleus DehumidifierGree-made units print a date code on the sticker as month and year, like 01/07.
• Sonos Audio & videoWe found no maker page that gives a date in these serial numbers, so we can't read them.
• Sony Audio & videoWe found no maker page that gives a date in these serial numbers, so we can't read them.
• Speed Queen Washer, DryerThe guides we found disagree on whether the first digits are year and week or year and month.
• Sta-Rite Well, Pool & spaOnly one guide describes Sta-Rite's old letter-and-year code, and we need two that agree or the maker's own.
• Stiebel Eltron Water heaterOnly one guide describes Stiebel Eltron's format, and we need two that agree or the maker's own.
• Strike First fire extinguisherWe found no published guide to dating a Strike First extinguisher, so check the cylinder stamp.
• Sub-Zero RefrigeratorSub-Zero prints the build date in words on the label, so there's nothing to decode.
• Summit RefrigeratorWe found no document that describes how Summit codes the date.
• Sundance Pool & spaSundance hasn't published how to read a build date from its serial, only where to find the plate.
• Superior Fireplace, Sump pumpSuperior lists serial ranges in recalls but never explains a date code.
• SuperStor Boiler, Water heaterOnly one guide describes this maker's formats, and we need two that agree or the maker's own.
• Takagi Water heaterOnly one guide describes Takagi's format, and we need two that agree or the maker's own.
• Tamko Roof & guttersShingle makers print a date only on the bundle wrapper, which is thrown away, so nothing on your installed roof shows its age.
• TCL Audio & videoWe found no maker page that gives a date in these serial numbers, so we can't read them.
• TempMaster Heating, Air conditioningOnly one guide describes this brand's format, and we need two that agree or the maker's own.
• Tesla Powerwall SolarTesla only says where the Powerwall serial sticker is, not how to read a date from it.
• Tesla Wall Connector EV chargerTesla only says to photograph the side label, and hasn't published how to read a date from it.
• Therma-Tru Windows & doorsTherma-Tru hasn't published how to read its door serials, and we found no guide that does.
• Thermador Dishwasher, Range & oven, Refrigerator, Washer, DryerThe guides we found disagree on how to read the FD number, and the maker hasn't published a rule.
• Thermo Pride Boiler, HeatingThe maker says its serial numbers don't include a date code.
• Thermo Products Boiler, HeatingThe maker says its serial numbers don't include a date code.
• Thor Kitchen Range & ovenWe found no maker page or guide that explains Thor serial numbers.
• Toro SprinklersToro hasn't published a date code for its controllers, and we found no guide that explains one.
• Toshiba Air conditioning, Heat pump, MicrowaveWe found no published rule for reading this brand's serial number.
• TOTO BathroomsTOTO hasn't published a date code for its toilet seats, and we found no guide.
• Towel warmers BathroomsWe found no maker information on how towel warmers are dated.
• TP-Link Internet & Wi-FiWe found no maker page that gives a date in these routers' serial numbers, so we can't read them.
• Triangle Tube Boiler, Water heaterTriangle Tube numbers its units in sequence, so the age can't be read without help from the maker.
• TUSHY BathroomsThe only guide we found wasn't on a site we could confirm belongs to the maker.
• U-Line KitchenNo maker or guide gives a date code, though many labels print the date.
• U.S. Boiler BoilerThis maker prints the build date on the label, so there's nothing to decode.
• UFT Boiler, Water heaterOnly one guide describes this maker's formats, and we need two that agree or the maker's own.
• Ultimate BoilerThe guides we found disagree with each other and with the maker's chart on how to read these serials.
• Ultra-Aire DehumidifierWe couldn't find a published date code for this maker.
• Union Energy Heating, Air conditioningOnly one guide describes this brand's format, and we need two that agree or the maker's own.
• Unitary Products Group Heating, Air conditioningOnly one guide describes this brand's format, and we need two that agree or the maker's own.
• Universal Security Instruments Smoke & CO detectorsUSI prints a plain date code like 2017JUN09 on the back label, so there is nothing to decode.
• Utica BoilerThe guides we found disagree with each other and with the maker's chart on how to read these serials.
• Vaillant BoilerWe found no published rule for reading this brand's serial number.
• Valor FireplaceValor shows where the serial number is but doesn't publish a date code.
• Vaughn Water heaterOnly one guide describes Vaughn's format, and we need two that agree or the maker's own.
• Velux Windows & doorsVelux's pages show where the serial label is but not how to read the date, and no second source explains it.
• Venmar VentilationWe couldn't find a published date code for this maker.
• Vent-A-Hood KitchenWe found no document that describes Vent-A-Hood serial numbers.
• Vermont Castings FireplaceOnly one maker notice describes it, and only for a few years of units, so we can't be sure it holds for yours.
• Viessmann BoilerWe found no published rule for reading this brand's serial number.
• Vinotemp KitchenNo maker or guide gives a date code, though many labels print the date.
• Vivint Security & alarmsVivint hasn't published a date format for its serials, so we can't read it.
• Vizio Audio & videoWe found no maker page that gives a date in these serial numbers, so we can't read them.
• Wallbox EV chargerWallbox hasn't published how to read a date from its charger serial numbers.
• Waste King KitchenWaste King hasn't published a date code, and we found no guide for it.
• Waterdrop Reverse osmosis water filterWaterdrop hasn't published how to read its serial numbers, and we found no guide that does.
• WaterFurnace Heating, Air conditioning, Heat pumpOnly one guide describes this brand's format, and we need two that agree or the maker's own.
• WaterWorker WellWe found no maker page or guide that explains the date code on WaterWorker tanks.
• Wayne Sump pump, WellWayne tells you to note the date code on the pump but doesn't say how to read it.
• Wayne Dalton Garage doorOnly one guide says the label shows a build date, and we need the maker or two guides that agree.
• Weather Shield Windows & doorsWe found no maker page or independent guide that explains a date code on Weather Shield windows.
• Weather-Rite HeatingWe found no published rule for reading this brand's serial number.
• Weathermaster Heating, Air conditioningOnly one guide describes this brand's format, and we need two that agree or the maker's own.
• Weil-McLain BoilerWeil-McLain's date isn't in the serial; it comes from a separate CP number that needs the maker's lookup.
• Well-X-Trol WellOnly an Amtrol email posted on a forum gives the code (day of year, then year), and no Amtrol page confirms it.
• Williams HeatingWilliams has no maker page, and only a forum call describes its serial format.
• Williamson Boiler, HeatingWilliamson's serial doesn't hold a date; the age comes from a separate CP number.
• Window World Windows & doorsWindow World buys windows from other makers and we found no guide to any date code on them.
• Wolf Range & ovenWolf doesn't print a build date or code one in the serial; the maker can look it up for you.
• X-Sense Smoke & CO detectorsWe found no maker page saying where X-Sense prints its manufacture date, so check the back label of the alarm.
• Xylem WellGoulds hasn't published a date rule, and newer pumps keep the build date in a scannable code on the label.
• Zephyr KitchenZephyr only says where the serial is; it has not published how to read a date.
• Zinsco ElectricalWe couldn't find any published way to read the date on a Zinsco panel.
• ZLINE Range & ovenZLINE prints the build date in words on wall-oven labels, so there is nothing to decode.
• Zodiac Pool & spaThe only guide puts its date rule in pictures we couldn't verify, and other sites disagree on year-and-week versus letters.
• Zoeller Sump pump, SepticZoeller stamps a date code on the nameplate but hasn't published how to read it.