If you have ever seen the way service technicians work, you probably have noticed their ability to quickly diagnose home appliance issues. Of course, it is partly due to the training and experience, but in many cases they just use the chart of Whirlpool microwave error codes like the one you will find below. The codes are programmed in home appliance controls, each of them refer to a specific issue (issues).
| Display | Likely Failure Condition | Recommended Repair Procedure |
|---|---|---|
| Flashing colon “:” | Power failure | After a power failure, the colon “:” will be flashing. Press any key to end this indication. The colon will then be steady when in standby |
| F2 | Membrane switch failure | 1. Unplug microwave oven or disconnect power. 2. Replace membrane switch. 3. If problem persists, replace electronic control. 4. Replace all parts and panels before operating. 5. Plug in microwave oven or reconnect power. |
| F3H | Humidity sensor out of range | 1. Unplug microwave oven or disconnect power. 2. Connect a new sensor to the electronic control (at P1). 3. Replace all parts and panels before operating. 4. Plug in microwave oven or reconnect power. 5. If problem persists, unplug microwave oven or disconnect power. 6. Replace electronic control. 7. Replace all parts and panels before operating. 8. Plug in microwave or reconnect power. |
| F6 | Microwave relay failure | 1. Unplug microwave or disconnect power. 2. Check wiring to Relay 4903 for short circuits. 3. If wiring is OK, replace electronic control. 4. Replace all parts and panels before operating. 5. Plug in microwave oven or reconnect power. |
| F3T | Exhaust Fan Thermostat Failure | 1. Check that the oven temperature is not below 5°C (41°F) or above 60°C (140°F). 2. If problem persists, replace the control system assembly. |