GE Appliances Microwave Error Code F1

Reviewed by the ApplianceErrors Editorial Team · Verified against manufacturer service documentation · Last verified: July 19, 2026

⚠ Medium Severity 👨‍🔧 Call a Pro

Open thermal sensor — cavity temperature not detected

The most common cause of the F1 error on a GE Appliances microwave is failed (open) cavity thermal sensor (~60% of cases); start with: clear and retry.

💰 DIY cost: $0–$0 👨‍🔧 Pro cost: $120–$250 Save $120+ by doing it yourself

GE Appliances Microwave error code F1 on the display panel — How the F1 code appears on a GE Appliances microwave display

What Does Error Code F1 Mean on a GE Appliances Microwave?

Open thermal sensor — cavity temperature not detected.

F1 indicates the control has read the cavity thermal sensor circuit as open (infinite resistance). During convection, combination, or roast modes the board watches for a temperature rise within about 15 minutes; an open sensor or broken harness means no rise is ever detected, so it halts heat-based functions. This differs from shorted-sensor or over-temperature faults in the related F2–F4 range, which report abnormal readings rather than a complete loss of signal.

Models affected: GE microwaves with convection capability — combination or convection over-the-range and built-in models that include a cavity thermal sensor

What owners report: Owners commonly report F1 appearing only when starting a convection, combination, or roast cycle, while plain microwave cooking keeps working normally. A single occurrence sometimes clears with a cancel or breaker reset, but if it returns each time convection is used it usually points to the sensor or its connector rather than a glitch.

What Causes Error Code F1?

Here are the most common causes in order of frequency. Start with the most likely cause before moving to the next:

1

Failed (open) cavity thermal sensor 60% of cases
2

Connector or harness fault 25% of cases
3

Control board input fault 15% of cases

How to Fix GE Appliances Microwave Error Code F1

👨‍🔧 Call a Pro Est. time: 1–3 hours

⚡ Safety first: Unplug the appliance before opening any panels or touching internal components.

1

Clear and retry

Press Cancel/Off to clear the code, then retry the convection function once — a one-off glitch clears.
2

Power-reset

Switch the breaker (or unplug the unit) for 60 seconds.
3

Book sensor replacement

The thermal sensor mounts on the cavity behind the outer case — microwave case removal carries shock risk even unplugged.

⚠️ Microwave capacitors store a lethal charge after unplugging. Do not open the case.

How to Reset Error Code F1

Press Cancel/Off to clear the display, or power-cycle at the breaker for 60 seconds. F1 returning during convection cooking confirms the sensor.

Note: If the error returns after resetting, the underlying issue has not been resolved. Work through the fix steps above.

Did this guide fix your appliance?

When to Call a Professional

All internal microwave repairs are professional territory — the high-voltage capacitor can hold a lethal charge long after unplugging. The fix itself (a sensor swap) is quick for a technician.

Average professional repair cost for this issue: $120–$250

Related Error Codes

Shorted thermal sensor

⚠ Medium Severity

Shorted touchpad — keypad fault

⚠ Medium Severity

Open humidity sensor — sensor cooking disabled

✓ Low Severity

Same Code on Other Brands

Error code F1 appears on these other brands too. See every brand that shows F1 →

Samsung Microwave F-1

Keypad membrane failure — dead or stuck key

LG Oven F1

Oven temperature sensor open circuit

Whirlpool Dryer F01

Main control board failure

Whirlpool Oven F1

Control board failure

Find Replacement Parts

Use these links to find the exact replacement parts for your GE Appliances Microwave:

🔩

Search PartSelect

GE Appliances Microwave repair parts

🔧

Search RepairClinic

Step-by-step video guides

External links — ApplianceErrors.com is not affiliated with these retailers.

Frequently Asked Questions

Can I keep using my GE Appliances Microwave when error F1 appears? +

You often can for a cycle or two, but the sensor issue behind F1 will keep interrupting normal operation until it is fixed. Plan the repair rather than ignoring the code.

What most commonly causes F1 on a GE Appliances Microwave? +

Across reported GE Appliances microwave repairs, the most frequent is failed (open) cavity thermal sensor (60% of cases), connector or harness fault (25%), then control board input fault (15%). Check them in that order before replacing any parts.

F1 keeps coming back after a reset — what should I check next? +

A reset only clears the stored F1 fault; if it returns, the sensor problem is still present. Move on to the physical checks — clear and retry, then power-reset — since the code will reappear until the root cause is resolved. This is a repair most owners hand to a technician.

How much does it cost to fix GE Appliances Microwave error F1? +

A DIY repair typically runs $0–$0 in parts, versus $120–$250 for a professional service call, so handling it yourself saves around $120. Expect the work to take a full service visit.

Which GE Appliances Microwave models show error F1? +

F1 is documented on GE microwaves with convection capability — combination or convection over-the-range and built-in models that include a cavity thermal sensor. Other units sharing the same control platform can display it too, so the fixes here generally transfer across the series.

Sources & References

• GE Appliances Support — official manufacturer documentation
• Our editorial & verification policy

Content verified against manufacturer service documentation. Last verified: July 19, 2026.

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