Whirlpool Dryer Not Heating: Causes and How to Fix It
Updated · from manufacturer service documentation
If a Whirlpool dryer runs but doesn't heat, the service diagnostic starts with the heater relay and works down through the heating circuit: heater element, High Limit Thermostat, and outlet thermistor. Restricted airflow is also directly flagged in the platform's own fault code (F4E3) as a cause that can affect heating performance.
What Causes a Whirlpool Dryer to Stop Heating
| Cause | Likelihood | DIY difficulty | Related part |
|---|---|---|---|
| Restricted air flow (F4E3 fault) | Common | Easy — check lint screen, secondary filter, exhaust fan | Vent / lint filter |
| Heater relay or connector problem (no voltage at relay) | Common | Moderate — multimeter | Heater relay |
| Heater element open (electrically failed) | Common | Moderate — continuity test | Heater element |
| High Limit Thermostat open | Less common | Moderate — continuity test | High Limit Thermostat |
| Outlet thermistor reading out of spec | Less common | Moderate — multimeter | Outlet thermistor |
| Centrifugal switch or CCU (control board) fault | Rare | Pro repair | Centrifugal switch / CCU |
How to Fix a Whirlpool Dryer That Won't Heat, Step by Step
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Check for the F4E3 restricted airflow fault code first
If your model shows this code, confirm the airflow system isn't blocked — check the lint screen, secondary lint filter, and exhaust fan before testing any electrical component.
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Quick-check line voltage
Per the service documentation, perform the Install Diagnostics check for L1 and L2 line voltage before opening anything up — this rules out a power-supply-side cause first.
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Check the heater relay
With the dryer unplugged and the top/rear panels removed, use an ohmmeter on the CCU to measure resistance at the violet wire terminal on the heater relay. A reading of ≤50 Ω means you move on to the next check; an open circuit means the heater element itself needs checking.
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Check the heater element for continuity
If the relay wiring looks good, check continuity across the heater (violet wire to center red wire) — replace the heater if it's electrically open.
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Check the High Limit Thermostat
Visually inspect the wire connections from the heater and centrifugal switch to the High Limit Thermostat, then check for continuity across it — replace it if it's electrically open.
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Check the outlet thermistor
Remove the P14 connector from the CCU and measure resistance between P14-3 and P14-6, comparing against the documented temperature/resistance table — replace the thermistor if the reading doesn't match its actual temperature.
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If L1 and L2 were both present and nothing above found the fault, the CCU is the last suspect
If L2 specifically wasn't detected, inspect the centrifugal switch before replacing the CCU.
Which Models This Applies To
Documented for the Whirlpool HybridCare Duet heat-pump dryer (2015, L-88 platform), which has both a heater element and a heat pump/compressor system — this page covers the heater-element side of "will not heat," which is the more common complaint. The platform's F4E3 fault code specifically calls out restricted airflow as affecting heating performance, alongside the electrical heating-circuit checks above.
See also: Dryer not heating (cross-brand overview).
Frequently Asked Questions
Is a Whirlpool dryer not heating always an electrical fault?
Not necessarily — restricted airflow (a documented fault code, F4E3) can affect heating performance too, so check the lint screen and vent path before assuming a part has failed.
What resistance should the heater relay show?
Per the service documentation, a reading of 50 ohms or less at the violet wire terminal on the heater relay is the threshold that rules the relay side in as working; higher or open readings point further down the heating circuit.
Can I test the heating circuit myself?
Yes, with the dryer unplugged and a multimeter — the service documentation lays out a step-by-step sequence (relay, heater element, High Limit Thermostat, outlet thermistor) that doesn't require special tools beyond an ohmmeter.
When does a no-heat issue point to the control board?
Only after the relay, heater element, thermostat, and thermistor have all tested normal and line voltage (L1/L2) is confirmed present — at that point the CCU is the documented next step.
Based on the Whirlpool HybridCare Duet heat-pump dryer service documentation (L-88 platform), Test #4: Heating System. Last updated: .