How to Read Appliance Model Numbers: Decode Brand Codes and Serial Dates

Common Symptoms

• You need to order a replacement part and the store asks for the model number
• An error code appeared on your appliance display and you need the brand-specific meaning
• You're describing an appliance problem to a technician or AI and need the exact model
• You want to verify whether your appliance is still under warranty
• You're buying a used appliance and want to determine its age and original specs
• A repair video or service manual doesn't match your appliance's internal layout
• You need to find out the refrigerant type or electrical requirements for your HVAC system
• You want to know if your appliance model has any known service bulletins or recalls

Most Likely Causes

1. 1

   Where to Find Model Numbers: Every Appliance Type

   Refrigerators: open the fresh food door and look on the inner wall of the door frame (jamb) or on the interior side wall near the top — usually a sticker or data plate on the upper left or right side. Side-by-side models may have it on the left wall near the top hinge. French door models almost always have it on the left door jamb. Washers (front-load): open the door and look on the door frame itself or inside the door rim — most manufacturers put it there. Top-load washers: look under the lid on the front lip of the opening, or on the inside back wall of the tub opening. Dryers: open the door and check the door frame edge, or look on the data plate inside the drum (spin the drum and look at the side wall). Dishwashers: open the dishwasher door and look on the inner side of the door panel, or along the left or right interior side wall near the top. Ranges and ovens: open the storage drawer at the bottom and look on the front frame, or check the door frame side panel. Also check behind the clock/control panel for a sticker. HVAC systems (air handler, furnace): the data plate is on the inside face of the access door, or on the side of the cabinet near the refrigerant line connections. Outdoor AC condenser: on the side of the unit, near the top or near the refrigerant service valves — look for a data plate or label. Water heaters: on the side of the tank, usually upper third, on a data plate label.

2. 2

   Samsung Model Number Decoding

   Samsung encodes the product type in the first 2 letters of the model number. RF = French door refrigerator (RF28R7351SR is a 28 cu ft French door). RS = side-by-side refrigerator (RS27T5200SR). RT = top-mount refrigerator. RB = bottom-mount (counter-depth). WF = front-load washer (WF45R6100AW — the 45 = 4.5 cu ft capacity). WA = top-load washer. DV = electric dryer (DV45R6100EW — 45 = 4.5 cu ft, E = electric). DV with gas suffix = gas dryer. DW = dishwasher. NE, NX, FE = electric range. NX, NR = gas range. Mini-split: AM, AR, or MH prefix. For capacity: the two digits immediately following the product type code indicate cubic feet (washers/dryers/refrigerators). The letter near the end of the model often indicates color: W = white, B = black, S = stainless. Serial number date code: Samsung serials begin with two digits for year and month — e.g., Z8 = 2018, December (Z = 2018, 8 = August — Samsung uses letter+digit where the letter indicates year: M=2012, N=2013, O=2014, P=2015, Q=2016, R=2017, S=2018, T=2019, U=2020, V=2021, W=2022, X=2023, Y=2024, Z=2025, and the digit = month 1-12). An appliance with serial starting with R4 was manufactured in April 2017.

3. 3

   LG Model Number Decoding

   LG model numbers follow a similar pattern. LRMVS = refrigerator (LR = LG refrigerator, M = multi-door, V = internal variable compressor, S = stainless). LRFXS = French door. LRSOS = side-by-side. LRTNC = top-mount. WM = front-load washer (WM4000H = 5.0 cu ft front-load). WT = top-load washer. DLE = electric dryer (DLEX5500V = 7.4 cu ft electric with steam). DLG = gas dryer. LDF = dishwasher (LDF5545ST). LRE, LSE, LTG = ranges (L=LG, T=cooking, G=gas or E=electric). LSXS, LRSXS = door-in-door refrigerators. For LG serials, the manufacture date is encoded in the first character of the serial: the format is typically a letter+digit+digit where the letter = year (similar to Samsung) and the first two digits = week of manufacture. An LG washer with serial starting with 904 was manufactured in week 04 of 2019. LG's manufacturing year letters: 7=2007, 8=2008, 9=2009, 0=2010, 1=2011 (numeric), then A=2011, B=2012, C=2013, D=2014, E=2015, F=2016, G=2017, H=2018, J=2019, K=2020, L=2021, M=2022, N=2023, P=2024.

4. 4

   Whirlpool Model Number Decoding

   Whirlpool's model number system uses a letter code at the start. WRS = side-by-side refrigerator (WRS325SDHZ = side-by-side stainless). WRF = French door. WRT = top-mount. WRB = bottom-mount. WFW = front-load washer (WFW5090JW = Cabrio front-load). WTW = top-load washer. WED = electric dryer (WED5000DW). WGD = gas dryer. WDT = dishwasher (WDT750SAHZ). WOS, WFE, WEE = electric ranges. WFG, WEG = gas ranges. Whirlpool also manufactures Maytag, Amana, and many Kenmore models — the internal engineering is often nearly identical. Serial number date: Whirlpool serials typically have 2 letters followed by digits. The first letter = manufacturing plant, the second letter = year. Year letters: G=2007, H=2008, J=2009, K=2010, L=2011, M=2012, N=2013, P=2014, R=2015, S=2016, T=2017, V=2018, W=2019, X=2020, Y=2021, Z=2022, A=2023, B=2024, C=2025. The next two digits = week of manufacture. So a serial starting with XN32 was made at plant X, year N=2013, week 32 (mid-August 2013). This is the most useful date code because it's consistent across Whirlpool, Maytag, Amana, and KitchenAid.

5. 5

   GE, Maytag, and Bosch Model Number Decoding

   GE model numbers: GFE = French door refrigerator (GFE28GYNFS). GSS = side-by-side. GTW = top-load washer (GTW685BSLWS). GTD = top-load dryer. GFW = front-load washer. GFD = front-load dryer. GDF = dishwasher (GDF630PGMBB). GE serials encode the year and month: the first two characters are a letter+digit where the letter = year (A=2001, B=2002, through the alphabet) and the digit = month (1=Jan, 2=Feb... 9=Sep, A=Oct, B=Nov, C=Dec). Maytag (Whirlpool subsidiary): MVW = top-load washer (MVW7232HW = 5.0 cu ft). MHW = front-load washer. MED = electric dryer. MGD = gas dryer. MDB = dishwasher. MFI, MFT = French door refrigerator. Maytag serials use the same Whirlpool date code format. Bosch: SHPM = built-in dishwasher series (SHPM88Z75N — the PM = PureDry, 88 = performance level). SHP = standard dishwasher. WAT = washer. WTW = heat pump dryer (European designation). Bosch serials: the first letter = manufacturing year (E=2014, F=2015, G=2016, H=2017, I=2018, J=2019, K=2020, L=2021, M=2022, N=2023, P=2024). The next three digits = day of year (Julian date).

6. 6

   Why Model Number Matters for AI Diagnosis

   AI diagnosis with just symptoms is like a doctor diagnosing without knowing the patient's age, medications, or medical history — possible, but much less accurate. When Fix-It Fast AI knows your exact model number, diagnosis shifts from general to specific: instead of 'your Samsung washer may have a door lock issue,' the AI can say 'the WF45R6100AW with an nd error code indicates door lock assembly DC64-00519B — the actuator arm is known to crack at the plastic tab on this platform; inspect it before replacing the entire assembly.' Model numbers also unlock the correct part numbers (so you order the right part on the first try, not a universal substitute that may not fit), the correct wiring diagram (so a technician following the wrong schematic doesn't misdiagnose a good component), and the correct torque specs and disassembly sequence (so the repair doesn't cause secondary damage). Always include your model number when uploading a photo or describing a problem at /diagnose or /appliance-scan — it's the single piece of information that most improves diagnosis accuracy.

Quick DIY Checks

1. 1Photograph the model number label before doing anything else. Phone cameras make this easy — open the door (or pull out the drawer) and use your flash to photograph the entire label. Capture both the MODEL number and the SERIAL number, and note where you found it. The model number is typically labeled MOD or MODEL, the serial is SER or SERIAL. The model number is the string of letters and numbers on the top line (e.g., WFW5090JW). The serial number is the string on the second line. Store the photo in a dedicated album on your phone labeled 'Home Appliances' — this saves 10+ minutes every time you need to order a part or call for service.
2. 2Enter the model number at a parts supplier to verify you have the right number. Go to a site like AppliancePartsPros.com or RepairClinic.com and enter the model number. If the site returns a parts diagram matching your appliance, you have the correct number. If it returns no results, the number was entered incorrectly (common errors: the letter O vs. number 0, the letter I vs. number 1, or misreading a J as a T). If the site returns results for a completely different appliance type, you may have the wrong label — check the appliance again. Some appliances have multiple labels (e.g., an energy guide sticker and a model label) and the wrong one is a barcode number, not a model number.
3. 3Determine your appliance's age from the serial number. Using the brand-specific codes in this guide: find the year encoding character in the serial number (typically the first or second character). Match it to the year code table for your brand. This tells you the manufacture year. If the appliance is 12+ years old and a major component (compressor, motor, control board) has failed, repair vs. replace math often favors replacement. If it's under 8 years old, parts are usually still available and the repair is worth doing. For Whirlpool-family appliances, the serial format (plant letter + year letter + 2-digit week + 6-digit sequence) is the most reliable system — the year letter is the second character.

1. 4Use the model number to find the service manual or wiring diagram. Search '[brand] [model number] service manual PDF' or '[brand] [model number] wiring diagram.' Many manufacturers post these publicly. Samsung, LG, and GE often have service data embedded in the appliance itself (accessible through a service menu on the control board). Whirlpool and Maytag service manuals are often behind a fold-out paper tucked inside the cabinet or behind an access panel — worth checking before searching online. The wiring diagram is especially useful for HVAC appliances, where the refrigerant circuit, electrical circuit, and control circuit are all shown on a single diagram taped to the inside of the access door.
2. 5Upload your model number and symptom to Fix-It Fast AI for a model-specific diagnosis. Go to /appliance-scan and enter your model number along with the symptom. The AI uses the model number to retrieve model-specific failure patterns, known service bulletins, the correct error code dictionary for your exact firmware version, and part number cross-references. For refrigerators and washers especially, error codes mean different things on different model platforms — an F5 E3 on a WFW5090JW means door latch failure, but on a different Whirlpool platform it may mean motor overheat. The model number routes the diagnosis to the correct error code library. If you don't have the model number, upload a photo of the front of the appliance to /diagnose — the AI can often identify the approximate model from visual features and provide a narrowed diagnosis.

Repair vs Replace

Recommended Tools & Parts

• Digital Multimeter

  Essential for follow-up testing after identifying the correct component from the model-specific service manual. The Klein Tools MM400 handles all residential electrical and appliance testing. Amazon affiliate link: search 'Klein Tools MM400 multimeter' with tag fixitfastai-20.

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• Label-Maker or Appliance Info Tags

  After finding model and serial numbers for all your appliances, create permanent labels for each appliance with the model number, serial number, manufacture date (decoded from serial), and install date. Stick them inside the cabinet door or in a home maintenance binder. Saves 10+ minutes per service event and prevents having to access the appliance label in tight spaces.

  $15–$25

  Buy on Amazon →

Links are Amazon affiliate links (tag: fixitfastai-20). Prices are estimates.