Author: ApplianceFixGuide Team

Problem: Moisture sensor failure—five consecutive loads dried without moisture detection

How to Fix Dryer Error

1. Unplug dryer and open door.
2. Locate two parallel stainless steel moisture sensor bars inside drum opening near lint filter.
3. Clean bars thoroughly with isopropyl alcohol and non-abrasive cloth—remove all fabric softener buildup, lint, and residue.
4. Inspect for physical damage to bars or foreign objects (coins, safety pins) bridging the gap causing short circuit.
5. Remove front lower panel to access sensor wiring harness connection at control board.
6. Disconnect harness and measure resistance across terminals—should read 1-2 megohms when dry. Near-zero resistance indicates shorted sensors.
7. If cleaning doesn’t resolve issue, replace moisture sensor assembly WPW
8. Route new harness carefully avoiding pinch points near drum rotation path.
9. Reconnect to control board ensuring secure connection.
10. Power on and press POWER button to clear error code. Run test load with damp towels to verify sensor operation—cycle should extend drying time appropriately.

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Problem: Inlet/front thermistor short circuit (resistance below 500 ohms)

How to Fix Dryer Error

1. Disconnect power and remove front lower panel (typically 2-3 screws at bottom front).
2. Locate inlet thermistor WP35001191 mounted near blower wheel inlet housing.
3. Disconnect wiring harness from thermistor terminals.
4. Set multimeter to resistance mode and measure across thermistor leads at room temperature.
5. Normal reading: 10k-12k ohms at 70°F. F3E3 indicates short circuit—reading below 500 ohms.
6. Inspect thermistor body for cracks, moisture ingress, or physical damage causing internal short.
7. Remove mounting screw securing thermistor to housing.
8. Install new thermistor WP35001191, ensuring sensor tip makes full contact with incoming air stream.
9. Reconnect wiring harness with terminals fully seated—verify no wire strands are exposed outside terminals.
10. Reinstall panel and run test cycle. Monitor inlet temperature in diagnostic mode if available—should track ambient temperature changes appropriately.

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Problem: Inlet and exhaust thermistor readings differ by more than 30°F indicating sensor mismatch or airflow problem

How to Fix Dryer Error

1. Disconnect power and remove both front lower panel and rear panel for access to both thermistors.
2. Locate inlet thermistor WP35001191 (front/blower housing) and exhaust thermistor WP3392519 (rear/exhaust duct).
3. Disconnect both thermistors and measure resistance simultaneously with two multimeters or swap positions to verify readings match within 5%.
4. If one thermistor reads significantly different, replace that sensor.
5. If both thermistors test within specification, diagnose airflow restriction: remove lint screen and clean thoroughly, inspect flexible vent hose for kinks/crushing, verify exterior vent flap opens freely, clean blower wheel housing of lint buildup.
6. Check drum seals for tears allowing air bypass.
7. Replace faulty thermistor(s)—WP35001191 for inlet, WP3392519 for exhaust.
8. Reassemble and run test cycle with vent disconnected temporarily to verify proper temperature differential (exhaust should run 20-30°F hotter than inlet during heating).
9. Reconnect vent system and verify F3E4 does not return.

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Problem: Control board thermistor circuit failure—ADC converter malfunction or reference voltage fault

How to Fix Dryer Error

1. Disconnect power and remove rear panel.
2. Test BOTH inlet and exhaust thermistors per F3E1/F3E3 procedures to rule out sensor failure.
3. If both thermistors test within specification (10k±2k ohms at room temp), fault lies in control board circuitry.
4. Inspect control board WPW10111608 for visible damage near thermistor input circuits: burnt components, leaking capacitors, or cold solder joints around sensor connector pins.
5. Check wiring harness between thermistors and board for damage—repair any broken wires with high-temperature wire nuts.
6. If harness intact and sensors good but error persists, ADC (analog-to-digital converter) circuit on board has failed.
7. Control board cannot be economically repaired—replace WPW10111608 assembly.
8. During installation, ensure all sensor harness connectors are fully seated before powering on.
9. After replacement, run diagnostic mode to verify both thermistor readings display correctly and track temperature changes during test cycle.

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Problem: Heater relay failure—relay not energizing when commanded by control board

How to Fix Dryer Error

1. Disconnect power and remove rear panel.
2. Locate main control board WPW10111608 and identify heater relay terminals.
3. Disconnect power cord and set multimeter to continuity mode.
4. Test relay contacts—should show open circuit when de-energized.
5. Restore power briefly (CAUTION) and start heat cycle—relay should click and show continuity across output terminals. No click indicates failed relay coil.
6. Test relay coil resistance (typically 80-150 ohms)—infinite resistance confirms open coil.
7. Inspect board around relay for burnt traces or overheating damage.
8. Control board cannot be repaired—replace entire WPW10111608 assembly.
9. Before installation, verify heating element is not grounded (test continuity between element terminals and metal housing—should show open circuit). Grounded element can damage new relay.
10. After replacement, verify 240V at heating element terminals during heat cycle and monitor exhaust temperature (135-155°F typical).

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Problem: Heater relay stuck closed causing continuous heating without cycling

How to Fix Dryer Error

1. IMMEDIATE ACTION: Disconnect power at circuit breaker—stuck relay creates fire hazard.
2. Remove rear panel to access heater assembly.
3. Inspect heating element for signs of severe overheating (melted terminals, discolored housing).
4. Check thermal fuse WP3392519 on blower housing—replace if blown (likely tripped from overheating).
5. Remove control board WPW10111608 and locate heater relay.
6. Visually inspect relay contacts for welding/sticking—contacts fused together indicate failure.
7. Test relay contacts for continuity with power disconnected—should show open circuit. Continuity indicates welded contacts.
8. Control board cannot be repaired—replace entire WPW10111608 assembly.
9. Before reinstalling, verify blower wheel rotates freely and entire vent system is clear to prevent recurrence of overheating.
10. After replacement, run short test cycle monitoring exhaust temperature with infrared thermometer—should cycle on/of every 45-60 seconds, not heat continuously.

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Problem: Restricted airflow—lint screen clogged, vent blocked, or excessive vent length

How to Fix Dryer Error

1. Power off dryer and remove lint screen—clean thoroughly under running water to remove fabric softener residue, then dry completely before reinstalling.
2. Disconnect flexible vent hose from dryer exhaust outlet—inspect for kinks, crushing, or lint blockages. Clean with dryer vent brush kit.
3. Inspect entire vent run to exterior: remove exterior vent cover and clean flapper mechanism, verify no bird nests or debris inside pipe.
4. Measure total vent length—should not exceed 40 feet with reductions for each 90° elbow (each elbow equals 5 feet of straight pipe).
5. Check blower wheel housing inside dryer—remove rear panel and vacuum lint buildup around blower wheel.
6. Inspect blower wheel for cracks or missing fins—replace if damaged (WPW
7. .
8. Verify drum seals are intact—torn seals allow air bypass reducing exhaust airflow.
9. Reconnect vent system ensuring minimal bends and proper support.
10. Run test cycle with moisture sensor disabled (timed dry) to verify proper airflow—exhaust air should feel strong and hot at exterior vent.
11. Error code clears automatically after successful cycle with adequate airflow.

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Problem: Low or no line voltage detected at heater circuit—missing L2 leg of 240V supply

How to Fix Dryer Error

1. Disconnect power at circuit breaker.
2. Remove rear panel to access power cord terminal block.
3. Restore power at breaker and carefully measure voltage at terminal block with multimeter: L1 to Neutral = 120V, L2 to Neutral = 120V, L1 to L2 = 240V.
4. If L1-L2 reads 120V instead of 240V, L2 leg is missing—check circuit breaker for partial trip (one pole tripped while other remains on). Reset breaker fully OFF then ON.
5. If voltage correct at terminal block but not reaching heater, test thermal fuse WP3392519 on blower housing for continuity—replace if open.
6. Check high-limit thermostat WP3392914 for continuity—replace if open.
7. Inspect wiring between terminal block and heater for loose connections or burnt terminals—repair as needed.
8. If household voltage is correct but dryer still shows F4E4, test house outlet with appliance-rated voltmeter—may require electrician to repair faulty circuit breaker or wiring.
9. After repair, verify 240V at heating element terminals during heat cycle.
10. Monitor exhaust temperature to confirm proper heating operation.

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Problem: Door switch circuit failure—switch not detecting closed door position

How to Fix Dryer Error

1. Unplug dryer and open door.
2. Locate door switch WPW10441007 mounted on front panel frame where door latch strikes.
3. Manually press switch plunger—should click audibly and feel positive engagement.
4. Disconnect wiring harness from switch terminals.
5. Set multimeter to continuity mode and test switch: plunger pressed = continuity, plunger released = open circuit.
6. If switch fails continuity test, replace WPW
7. Remove mounting screws (typically 2 screws) and extract old switch.
8. Install new switch ensuring proper alignment with door strike—door must fully depress plunger when closed.
9. Reconnect wiring harness securely.
10. Close door firmly and start test cycle—dryer should operate normally. If error returns, check door alignment and strike plate position—bent door frame can prevent full switch engagement.

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Problem: Door switch stuck closed—detecting door closed when actually open

How to Fix Dryer Error

1. Unplug dryer and observe door switch WPW10441007 plunger with door open—plunger should be fully extended (not depressed).
2. If plunger appears stuck inward, manually pull plunger outward while spraying contact cleaner into mechanism.
3. Work plunger in/out 10-15 times to free mechanism.
4. Disconnect wiring harness and test switch continuity with multimeter: plunger extended (door open) should show open circuit; plunger pressed (door closed) should show continuity.
5. If switch shows continuity with plunger extended, internal contacts are welded—replace WPW
6. Remove mounting screws and extract old switch.
7. Install new switch ensuring proper alignment—door strike must fully depress plunger only when door is completely closed.
8. Verify door gasket is not torn or folded inward preventing proper door closure.
9. Reconnect wiring and test—dryer should not start with door open, and should start immediately when door closes fully.
10. Error code clears automatically after successful door operation.

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