Frigidaire Microwave Error Codes: What They Mean & How to Fix Them

Common Symptoms

• Display shows F1, F2, F3, or F5 with microwave not functioning
• Display shows SE or 5E (sensor/touchpad error)
• Display shows PF after power outage or surge
• Microwave beeps repeatedly and displays an error code
• Error code appears during cooking cycle and cycle aborts
• Code clears temporarily but returns within minutes or hours

Most Likely Causes

1. 1

   F1 — Door Switch Fault

   F1 indicates the control board detected an unexpected state from the door interlock switch circuit. This usually means a door switch has failed open or closed, a door switch wiring harness connector has come loose, or the door latch mechanism is worn and not fully actuating the switches. On OTR models, F1 can also appear after prolonged cooking at high power if the door switch heats up and becomes intermittent. Hard reset first; if the code returns, test all three door interlock switches with a multimeter.

2. 2

   F2 — Thermal Cutout Tripped

   F2 signals a thermal protection event — the internal temperature exceeded safe limits and a thermal cutout opened to protect the magnetron or electronics. Common causes: blocked air vents (grease filter clogged on OTR models), running the microwave empty, or a failing cooling fan that no longer moves adequate airflow. After a hard reset, allow the unit to cool for 15–20 minutes. If F2 returns after minimal use, inspect and clean all vents, check the cooling fan, and test the thermal cutout for continuity.

3. 3

   F3 — Keypad / Touchpad Fault

   F3 indicates the control board detected a shorted or stuck key on the membrane touchpad. This can be caused by moisture infiltration behind the membrane, a physically damaged key, or delamination of the membrane from the control board ribbon connector. On some Frigidaire models, the touchpad and control board are one integrated assembly; on others (e.g., FGMV17WNVF OTR), the membrane keypad is a separate replaceable part ($30–$60). Try a hard reset first — if F3 returns on any key press, the touchpad assembly needs replacement.

4. 4

   F5 — Humidity Sensor Error

   F5 appears on Frigidaire models with sensor cooking capability (auto-cook, auto-defrost functions). The humidity sensor detects steam from food to determine cooking progress. F5 indicates the sensor circuit returned an out-of-range reading to the control board. This can be caused by a failed humidity sensor, a loose sensor connector, condensation in the sensor housing, or control board failure. Sensor cooking functions (Auto Cook, Auto Defrost) will not work while F5 is active, but manual timed cooking typically still functions.

5. 5

   SE / 5E — Sensor / Stuck Key Error

   SE (displayed as 5E on 7-segment models) is one of the most common Frigidaire microwave errors. It indicates a stuck or continuously actuated touchpad key. This is often caused by moisture under the membrane, a damaged keypad surface, or control board logic failure. SE almost always appears during cooking or after power cycling. A hard reset (unplug 60 seconds) clears it temporarily in most cases. If it returns on every use, the membrane touchpad or the control board needs replacement.

6. 6

   PF — Power Failure

   PF is not a fault code in the traditional sense — it indicates power was interrupted (outage, surge, or momentary voltage drop) and the clock needs to be reset. No repair is needed for PF. Simply press CANCEL/STOP to clear the code and then set the clock. If PF appears repeatedly without a known power interruption, check the outlet voltage and consider whether the circuit is being overloaded when other appliances run simultaneously. Repeated unexpected PF codes can also indicate a failing control board capacitor that fails to hold settings during micro-interruptions.

Quick DIY Checks

1. 1Perform a hard reset — the universal first step for any Frigidaire microwave error code. Unplug the microwave from the wall outlet (or switch off the dedicated circuit breaker for OTR models). Wait a full 60 seconds. Plug back in and observe. Many error codes, including SE/5E and PF, clear permanently after a hard reset because they were triggered by a transient voltage event or single microcontroller glitch. If the code does not return in the next several uses, no further action is needed. If the code returns within the same session or on the next use, proceed to targeted diagnosis.
2. 2For F1 (door switch fault): test all three door interlock switches. Unplug the microwave. CRITICAL: discharge the high-voltage capacitor using an insulated discharge tool or a 10kΩ, 25W resistor bridged across the terminals before opening the cabinet. Access the door latch assembly — on countertop models, remove the inner door panel; on OTR models, remove the control panel surround. Using a multimeter in continuity mode, test each switch by pressing its actuator: primary switch (should be closed/continuity when door is closed), secondary switch (same), monitor switch (should be open/OL when door is closed). A switch that fails this test must be replaced — use Frigidaire part 5304509706.
3. 3For F2 (thermal cutout): allow the microwave to cool completely (at least 20 minutes off, unplugged). On OTR models, clean the grease filter thoroughly — a clogged grease filter is the #1 cause of thermal overload. After cleaning, plug in and attempt to run. If F2 returns quickly (within 2–3 minutes of operation), the cooling fan may be failing or the thermal cutout has failed permanently (not resettable). Unplug, discharge the capacitor, and test the thermal cutout with a multimeter — a good cutout reads continuity; a failed one reads OL and must be replaced (part 5308000010 or model-specific equivalent).

1. 4For F3 or SE/5E (keypad fault): after confirming a hard reset did not permanently clear the code, inspect the touchpad surface for physical damage — cracks, bubbles under the membrane, or stickiness from spilled liquids. Clean the touchpad surface with a barely-damp cloth and allow to dry completely. If the membrane appears intact, the fault is internal (moisture behind the membrane or delaminated ribbon connector). On models with a separable membrane touchpad (check your model — FGMV17WNVF-series), order a replacement touchpad assembly ($30–$60). On models where the touchpad is integrated with the control board, the entire board must be replaced.
2. 5For F5 (humidity sensor): first perform the hard reset. If F5 returns, locate the humidity sensor — on Frigidaire OTR models it is typically mounted in the oven cavity ceiling or side wall, connected by a small 2-wire harness. With the unit unplugged and capacitor discharged, check the sensor connector for corrosion or loose connection. Reconnect firmly. If the F5 code still returns after reseating the connector, the humidity sensor element needs replacement. Sensor cooking functions (Auto Cook/Auto Defrost) will be non-functional until repaired; manual timed cooking is unaffected.
3. 6For PF (power failure): clear the code by pressing CANCEL/STOP, then reset the clock. If PF is appearing repeatedly without obvious power interruptions, plug the microwave into a UPS or a different dedicated circuit to rule out supply voltage issues. On OTR models, verify the plug-in connection behind the unit is not loose. If PF codes continue on a known stable circuit, the control board's internal clock-hold capacitor has likely failed — control board replacement is required.
4. 7Model-specific notes: Over-the-range Frigidaire models (FGMV-series, FFMV-series) are more prone to F2 and F5 codes due to grease and steam exposure during stovetop cooking — inspect and clean the grease filter monthly. Countertop models (CPMO-series, FGMO-series) are more prone to SE/5E codes due to membrane keypad exposure to kitchen humidity. Always locate your full model number (inside the door frame on a silver sticker) before ordering any parts — Frigidaire uses multiple control board variants across similar-looking models.

Repair vs Replace

Recommended Tools & Parts

• Frigidaire Microwave Door Interlock Switch (5304509706)

  OEM door interlock switch for Frigidaire microwaves. Required for F1 error code diagnosis. Test with multimeter in continuity mode before ordering. Replace all three switches together if one fails.

  $8–$15 each

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• Frigidaire Microwave Thermal Cutout (5308000010)

  Non-resettable thermal fuse/cutout for Frigidaire microwave. Trips during overheating (F2 code). Test with multimeter — tripped cutout reads OL. Verify part number against your specific model.

  $10–$20

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• Frigidaire Microwave Touchpad / Membrane Keypad (Model-Specific)

  Replacement membrane touchpad for Frigidaire microwaves experiencing F3 or SE error codes. Part number varies by model — search by your full model number. On some models the touchpad is integrated with the control board.

  $30–$60

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• Frigidaire Microwave Control Board (Model-Specific)

  Replacement main control board (PCB) for Frigidaire microwave. Required when error codes persist after replacing switches, thermal cutout, and touchpad. Part number is model-specific — always verify against your full model number from the door frame label.

  $80–$150

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• Capacitor Discharge Tool for Microwave Repair

  Insulated discharge tool for safely discharging the microwave high-voltage capacitor before internal access. Required safety item for any internal component inspection or replacement.

  $10–$20

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

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