LG microwave runs but does not heat: F5 and SE diagnosis
The microwave turns on, the timer counts down, but the food stays cold or the display shows F5 or SE.
Solutions
Microwaves
1 procedures · 4 codesCountertop, OTR and NeoChef. Door interlocks, keypads, magnetrons.
Error codes
Microwaves
Showing 4 / 4 codes
| Code | Meaning | First check | Procedure |
|---|---|---|---|
| F1MW | MeaningThermistor / sensor error on the cavity temperature probe.Service call likely | First checkLet it cool fully: an over-temperature trip after long use reads the same way. | · |
| F3MW | MeaningHumidity sensor error on sensor-cook models.Service call likely | First checkClean the sensor vent inside the cavity ceiling; grease film blinds it. | · |
| F5MW | MeaningDoor sensing error: the interlock switches disagree about the door state.Service call likely | First checkDoor alignment. Never defeat an interlock: the monitor switch will blow the line fuse by design. | · |
| SEMW | MeaningStuck key error on the membrane keypad.User-fixable | First checkUnplug for two minutes, then press each key once to find the one that does not click back. | · |
No code matches that search.
Codes vary by model year and platform. Always confirm against the manual for your exact model number before ordering parts.