Whirlpool Microwave Error Codes: F1E1, F2E1, F3E1, Door, PF & More

Common Symptoms

• F1E1 code — microwave displays EEPROM error, won't start
• F2E1 code — shorted key, keypad unresponsive
• F3E1 code — temperature sensor fault, erratic heating
• F3E2 code — humidity sensor error
• Door error code — microwave won't start, door fault
• PF code — power failure, clock needs reset
• No heat with no error code — microwave runs but doesn't cook

Most Likely Causes

1. 1

   F1E1 — Main Control Board EEPROM Error

   F1E1 means the main control board (W10441673) has detected an EEPROM memory error — the board's non-volatile memory has corrupted or failed. First step is always a power cycle: unplug the microwave for 2 full minutes (longer than a typical reset), restore power, and test. A transient EEPROM fault — caused by a voltage spike or brief power interruption — often clears with a cold boot. If F1E1 returns after the power cycle, the main control board W10441673 has failed and needs replacement. Note: on the Whirlpool platform (shared with Maytag and KitchenAid), the main board is typically not repairable — replace the entire board assembly. Maytag and KitchenAid OTR models that share this board: verify part compatibility by entering your full model number at a Whirlpool parts supplier.

2. 2

   F2E1 — Shorted Key (Stuck Keypad)

   F2E1 means the control board detected a key stuck in the pressed position or a short in the keypad membrane. This is the same Whirlpool platform code used across ranges, wall ovens, and microwaves — the keypad architecture is shared. First step: power cycle (unplug 60 seconds). If F2E1 persists, inspect the keypad membrane for physical damage, moisture intrusion, or a key that is physically stuck. Clean the membrane surface and the area around stuck keys with isopropyl alcohol. If the code continues after cleaning and a power cycle, the keypad membrane has failed. Whirlpool microwave keypads vary by model — use your full model number to locate the correct membrane replacement part.

3. 3

   F3E1 — Thermistor (Temperature Sensor) Fault

   F3E1 means the control board is reading an abnormal resistance from the cavity thermistor. Part number: W10439045. Test after unplugging: locate the thermistor (small cylindrical or disc sensor mounted in the cavity wall or near the magnetron), disconnect the two-wire plug, and probe with a multimeter in resistance mode. At room temperature (68–77°F), a working Whirlpool microwave thermistor reads approximately 10kΩ. OL (open circuit) = failed thermistor, replace with W10439045. Near-0Ω (shorted) = also failed, replace. Thermistor replacement is a low-voltage repair safe for DIY with the unit unplugged.

4. 4

   F3E2 — Humidity Sensor Fault

   F3E2 indicates a fault in the humidity sensor (W10261029) — used on Whirlpool models with sensor cooking features. The humidity sensor detects steam released by food and adjusts cooking time automatically. A failed humidity sensor means sensor cooking modes won't work correctly, though manual timed cooking functions are unaffected. Test: unplug the microwave, locate the humidity sensor (typically mounted near the vent in the cavity top), disconnect the wiring, and test with a multimeter. Humidity sensor resistance varies widely with humidity level — an open circuit (OL) at any humidity level = failed sensor. Replace with W10261029 if sensor cooking accuracy has declined or F3E2 is present.

5. 5

   Door Error — Door Switch Fault

   A door error code (displayed as 'door' or as a door-related fault on some models) indicates the control board cannot confirm the door is properly closed. Whirlpool uses a 3-switch door interlock system identical in function to LG and Samsung — primary switch, secondary switch, and monitor switch. Part number: W10569845 (verify model match). The replacement sequence matters: replace primary first, then secondary, then confirm both work before installing the monitor switch. The monitor switch blows the main fuse if primary or secondary fail to open when the door opens — a UL safety feature that causes repeat fuse blowing if switches are replaced out of order.

6. 6

   PF — Power Failure (Clock Reset Only)

   PF means the microwave detected a power interruption — the code appears after any power outage, surge, or unplugging event. PF is not a fault requiring repair — it simply means the clock needs to be reset. Press Clock, enter the time, and press Clock again to clear PF. If PF appears repeatedly without any power outages, the microwave's power supply may be experiencing voltage fluctuations from a circuit issue — check the outlet voltage with a multimeter (should be 115–125V AC) and verify the microwave is on a dedicated circuit.

7. 7

   No Heat with No Error Code — Diode and Capacitor

   A Whirlpool microwave that runs normally (display, turntable, light) but produces no heat with no error code displayed typically has a failed high-voltage diode (W10492276) or capacitor (WP5304476357). The diode rectifies AC from the transformer into the DC voltage that drives the magnetron. A failed diode produces a loud humming sound during cooking with no heat. Test: MANDATORY capacitor discharge first (2,100V stored charge). After discharging, disconnect the diode and test in diode mode on your multimeter — it should conduct in one direction and block in the other. A diode that reads OL in both directions or conducts in both directions = failed. The capacitor WP5304476357 can also fail open or short — test capacitance with a multimeter in capacitance mode (typical value ~1µF; OL = open capacitor = failed). Replace failed component. This is a Hard repair due to mandatory 2,100V capacitor discharge.

Quick DIY Checks

1. 1Power cycle first: unplug the Whirlpool microwave for 2 full minutes (a longer-than-typical reset is important for F1E1 EEPROM faults). Restore power and test all functions. PF codes clear when you reset the clock — press Clock, enter time, press Clock. If F1E1, F2E1, F3E1, or F3E2 clears after the power cycle and doesn't return, the error was transient. If the same code returns within one or two uses, proceed to component testing.
2. 2Enter Whirlpool service mode (supported models): with the microwave plugged in and idle, press 1, 5, 5, 5 in sequence. On compatible models (WMH31017HS, WML55011HS), the display will enter service mode and cycle through stored error codes. Record all codes — this reveals whether multiple faults are present simultaneously.
3. 3Test the thermistor for F3E1: unplug the microwave. Locate the thermistor W10439045 (in the cavity wall or near the magnetron — check your model's parts diagram). Disconnect the two-pin connector. Set multimeter to resistance mode. Probe the two terminals — at room temperature, a working thermistor reads approximately 10kΩ. OL or near-0Ω = failed thermistor, replace with W10439045. This is a low-voltage, DIY-safe repair.

1. 4Test door switches for door error code: unplug the microwave. Remove the outer cabinet (typically 6–8 screws on back and sides). Locate the three door switches near the door latch. Use a multimeter in continuity mode — press each switch actuator manually and verify it transitions from open to closed (and back). Replace any switch that fails continuity transition. Part: W10569845. Replace in order: primary, secondary, confirm both work, then monitor switch. After replacement, test the door open/close cycle 5–10 times before closing the cabinet.
2. 5For no heat with no code — diode test (after mandatory capacitor discharge): unplug the microwave. Remove outer cabinet. DISCHARGE THE HIGH-VOLTAGE CAPACITOR using an insulated discharge resistor (10kΩ, 10W) held against both capacitor terminals for 5 seconds minimum. Verify with multimeter set to DC volts — capacitor should read near 0V. Locate the high-voltage diode W10492276 (small black component with two leads, connected to the capacitor). Set multimeter to diode test mode. The diode should show a reading in one direction (typically 0.5–0.7V forward) and OL in the reverse direction. OL in both directions or conduction in both directions = failed diode, replace with W10492276.
3. 6For F2E1 (shorted key): unplug the microwave. Clean the entire keypad surface with a clean, dry cloth to remove any debris or moisture. Look for a key that is visibly stuck or sunken. Apply gentle pressure around each key to see if any are mechanically stuck. If a specific key is stuck, carefully clean around it with a cotton swab and 90%+ isopropyl alcohol. Power cycle and test. If F2E1 persists with no stuck key, the membrane has internally shorted — replacement is required. Use your model number to find the correct membrane part.

Repair vs Replace

Recommended Tools & Parts

• Whirlpool Microwave Main Control Board W10441673

  Main control board for Whirlpool OTR microwaves. Fixes F1E1 EEPROM error. Power cycle for 2 full minutes before ordering — many F1E1 codes are transient. Verify model compatibility. Also used on some Maytag and KitchenAid models.

  $60–$135

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• Whirlpool Microwave Thermistor W10439045

  Cavity thermistor for Whirlpool microwaves. Fixes F3E1 temperature sensor error. Should read approximately 10kΩ at room temperature. Low-voltage DIY repair.

  $10–$28

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• Whirlpool Microwave Door Switch W10569845

  Door interlock switch for Whirlpool OTR microwaves. Fixes door error code. 3-switch system — replace in correct order (primary, secondary, monitor). Test all three before ordering.

  $8–$22

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• Whirlpool Microwave High-Voltage Diode W10492276

  High-voltage diode for Whirlpool microwaves. Fixes no-heat/no-code with humming sound. Mandatory capacitor discharge (2,100V) before testing or replacing. Test in diode mode — should conduct one direction only.

  $8–$20

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• Whirlpool Microwave Capacitor WP5304476357

  High-voltage capacitor for Whirlpool microwaves. Fixes no-heat condition (with diode W10492276). CRITICAL: stores 2,100V — mandatory discharge before any internal access. Test capacitance (~1µF) and ESR before replacing.

  $15–$35

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• Capacitor Discharge Tool (Microwave Safety)

  Insulated discharge tool for safely discharging microwave high-voltage capacitors (2,100V) before internal service. Required for any repair involving diode, capacitor, magnetron, or transformer.

  $12–$25

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

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