.xp{font-family:Arial,Helvetica,sans-serif;color:#1b1b1b;line-height:1.5;max-width:1100px;margin:auto}.xp *{box-sizing:border-box}.xp .hero{position:relative;overflow:hidden;border-radius:12px;padding:22px 28px;margin-bottom:18px;color:#fff;background:#111;isolation:isolate}.xp .hero:before{content:"";position:absolute;inset:0;z-index:-2;background:url('https://cdn.shopify.com/s/files/1/0897/7783/2225/files/4444444444444444.png?v=1777040489') center/cover no-repeat}.xp .hero:after{content:"";position:absolute;inset:0;z-index:-1;background:linear-gradient(135deg,rgba(0,0,0,.86) 55%,rgba(0,0,0,.45))}.xp .label{display:inline-block;background:#e60000;color:#fff;font-weight:800;font-size:11px;letter-spacing:.05em;padding:6px 10px;border-radius:20px;margin-bottom:9px}.xp .hero h2{font-size:clamp(22px,3vw,34px);line-height:1.1;margin:0 0 8px;color:#fff!important}.xp .hero p{margin:0;color:#fff!important}.xp .specs{display:flex;flex-wrap:wrap;gap:7px;margin-top:10px}.xp .specs span{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.25);padding:5px 8px;border-radius:7px;font-size:12px;font-weight:700;color:#fff!important}.xp h2{font-size:27px;margin:28px 0 10px;color:#111}.xp .grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:12px;margin:16px 0}.xp .card{border:1px solid #ddd;border-radius:10px;padding:16px;background:#fff}.xp .card strong{display:block;color:#e60000;margin-bottom:3px}.xp ul,.xp ol{padding-left:22px}.xp li{margin:6px 0}.xp .tip{border-left:5px solid #e60000;background:#f6f6f6;padding:16px 18px;border-radius:9px;margin:22px 0}.xp .note{font-size:14px;color:#444;background:#fafafa;border:1px solid #e5e5e5;border-radius:9px;padding:14px;margin-bottom:24px}@media(max-width:640px){.xp .hero{padding:19px}.xp .hero h2{font-size:24px}.xp h2{font-size:24px}} FROST BUILD-UP & DEFROST FAILURE Whirlpool WP4391974 Refrigerator Defrost Timer Restores automatic defrost cycles — stops frost build-up, temperature swings, and compressor overrun in Whirlpool and compatible refrigerators. Part WP4391974 Replaces 4391974, W10124406, 215846604 + 60 more OEM & XPart (Supco SPA1401AD) Options Genuine Whirlpool OEM Whirlpool Refrigerator Defrost Timer WP4391974, Fixes Frost Build-Up & Failed Defrost Cycles The Whirlpool WP4391974 Defrost Timer controls the automatic defrost cycle in your refrigerator, cycling the defrost heater on and off at timed intervals to prevent frost accumulation on the evaporator coils. It replaces 4391974, W10124406, 215846604, 00-NRK4, 00-NRK5, 045548-01, 045548-02, 1107752, 13-5699, 13-8938, 14205043, 14205050, 24399-1, 26250-1, 26308-2, 27039-1, 27039-2, 27039-3, 27039-5, 29811-3, 4341046, 4355375, 4355378, 4355379, 4355380, 54113-1, 54113-10, 54113-11, 54113-4, 54113-6, 55448-1, 55448-3, 55448-4, 55467-1, 55467-5, 58194-1, 65322-1, 65322-2, 65702-1, 65702-2, 66128-1, 66128-2, 66556-1, 66556-2, 66556-3, 66556-4, 66556-5, 66556-6, 66556-7, 69217192, 69381715, 69543-1, 831394, RA43819-1, RA43869-1, RA43870-1, RA43948-1, Y00NRK4, Y00NRK5, Y04554801, Y04554802 when fitment is confirmed by the full appliance model number. An XPart aftermarket option (Supco SPA1401AD) is also available. Is This the Right Part? Part NumberWP4391974 Replaces4391974, W10124406, 215846604 + 60 more ManufacturerWhirlpool Appliance TypeRefrigerator Confirm the complete model number before ordering. Defrost timers vary by cycle duration, voltage rating, terminal configuration, and mounting style. Do not order by part number alone. Common Symptoms Excessive frost or ice build-up on the back wall of the freezer compartment Refrigerator not cooling properly — freezer cold but fridge section warm Refrigerator runs constantly without cycling off Defrost heater never activates — evaporator coils completely iced over Check Before Replacing Manually advance the defrost timer with a screwdriver — if the defrost heater activates, the timer is confirmed faulty Test the defrost heater with a multimeter for continuity — a burned-out heater can mimic a failed timer Check the defrost thermostat (limit thermostat) — an open thermostat will prevent the heater from firing even with a good timer Inspect the wiring harness and timer terminals for corrosion, burn marks, or loose connections Pro Tip: Before replacing the defrost timer, manually turn it to the defrost position using a flat-head screwdriver on the timer dial. If the defrost heater comes on and the frost melts, the timer is the confirmed cause. If the heater still doesn’t activate, test the heater and thermostat before ordering — replacing the timer won’t fix a burned-out heater. Part Details Part TypeDefrost Timer Primary FunctionControls timed defrost cycles to prevent evaporator coil frost accumulation Key FeatureOEM direct replacement; XPart option (Supco SPA1401AD) also available ConditionGenuine OEM (WP4391974) or XPart — Supco SPA1401AD Installation Notes Disconnect power to the refrigerator before beginning. Photograph the timer wiring harness, terminal positions, and mounting orientation before removal. Compare the replacement timer with the original — confirm terminal count, cycle duration, and voltage rating match. Inspect the wiring harness, defrost heater, and thermostat for damage before installing the new timer. After installation, restore power and manually advance the timer to verify the defrost cycle activates correctly. If you are unsure about wiring or terminal identification, a qualified appliance technician can complete this repair quickly and safely. Verified Compatible Models Model numbers not confirmed — contact us with your full model number (including all suffixes and revision digits) to verify fitment before ordering. Fitment reminder: Match the complete model number, including suffixes and revision digits, before ordering. Additional compatible models may exist — contact us if your model is not listed.
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