GE Microwave F1 — What It Means & How to Fix It
F1 means the thermal sensor circuit reads open — or the oven detected excessive heat. Cool it down and try the 30-second reset.
What this code means
GE defines F1 as an open thermal sensor, often linked to excessive heat. The oven is protecting itself when it thinks the temperature side is out of range.
F1 shows after heavy or long cooking, or on startup if the oven is still hot inside. If the unit was just overheating from use, cooling it often clears it.
Most likely causes
| Cause | How likely | DIY-fixable? |
|---|---|---|
| Oven still hot from heavy or continuous cooking | Common | yes |
| Thermal sensor failed open | Less common | no |
| Sensor wiring or connector issue | Less common | no |
What you can try yourself
- Cancel the cycle and open the door so the cavity can cool completely.
- Reset power at the breaker for 30 seconds, then restore it.
- Let the oven rest a few minutes before the next use.
- If F1 returns on a cool oven, the sensor or its wiring is at fault — call a technician; it's inside the cabinet near high-voltage parts.
When to call a technician
- F1 stays on after the oven is fully cool
- F1 reappears moments after any cook cycle starts
Typical professional repair cost: $0 if cooling clears it; otherwise a service visit, typically $100–$250 for a thermal sensor replacement.
Frequently asked questions
I just cooked for an hour — is F1 expected?
It can be exactly that: the oven's way of saying it got too hot. Cool it fully, reset, and it often disappears.
Should I worry about the sensor itself?
Only if the code returns on a cold oven — then the sensor or wiring should be tested and replaced by a technician.
Sources checked
Error meanings can vary by model. This guide was checked against the documentation above; use the manual for the model number on your own appliance when it differs.
Related GE codes
- GE Microwave F2 F2 is a shorted thermal sensor fault — the sensor circuit reads closed when it shouldn't, so the oven locks out.
- GE Microwave F3 F3 means the touch pad is reading as shorted — often a key pressed over 60 seconds or moisture on the pad.
- GE Microwave F4 F4 means the humidity sensor circuit reads open — the sensor that tracks steam during cooking isn't reporting, so the oven locks out.
- GE Microwave F5 F5 means the humidity sensor reads shorted — the steam sensor is stuck in one state, so sensor-cook cycles lock out.
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