F5
GE Microwave
Severity: CriticalWhat Does This Error Mean?
GE microwave error F5 means a relay on the main control board is stuck open or permanently closed. Relays on the control board switch power to the magnetron, the turntable motor, and other components. F5 almost always indicates a failed control board and is a safety-relevant fault that prevents the microwave from operating.
Affected Models
- GE Profile Microwave
- GE Cafe Microwave
- GE Spacemaker
- GE JES Series
- GE JVM Series Over-the-Range
Common Causes
- Relay on the control board has welded closed or stuck open from normal wear over years of use
- Power surge or voltage spike that burned a relay contact on the control board
- Moisture reaching the control board and corroding the relay contacts
- Control board component failure causing the relay detection circuit to misfire
- Excessive heat inside the microwave cabinet degrading relay solder joints over time
How to Fix It
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Unplug the microwave for 60 seconds and power it back on.
A power surge can trigger a relay into a protective state that clears on reset. If F5 disappears after the reset and does not return during the next several uses, the fault was transient and no further action is needed.
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Check whether a power surge, outage, or lightning event preceded the F5 error.
If the error appeared after an electrical event, a voltage spike likely damaged the relay on the control board. Fit a surge protector on the microwave's outlet going forward to protect the replacement board from the same event.
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Do not attempt to keep using the microwave while F5 is active.
A relay stuck closed on a microwave control board can leave the magnetron energised when it should be off — including when the door is open. F5 is treated as a safety fault by GE and the machine locks out all functions until repaired.
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Contact GE Appliances support or an authorised appliance repair technician for control board replacement.
The control board is located behind the control panel and a qualified technician can typically replace it without accessing the high-voltage magnetron section. Provide your full model number (inside the door frame) to ensure the correct replacement board is ordered. Control boards for GE microwaves typically cost $80–$200 in parts.
Frequently Asked Questions
What does a relay do in a microwave control board?
A relay is an electrically controlled switch — the control board sends a low-current signal to the relay coil, which magnetically closes or opens a set of contacts to route mains voltage to a component. In a microwave, relays typically control the magnetron (the part that generates microwaves), the turntable motor, and the light. A relay stuck closed means a component stays powered when it should be off; stuck open means it never powers on at all.
Is F5 more dangerous than F3 or F7 on a GE microwave?
Yes — F3 and F7 are touchpad faults that prevent the machine from accepting commands, but they do not create a risk of the magnetron running unexpectedly. F5 is a relay fault, which means a switch controlling high-voltage components may be stuck in the wrong position. This is why GE treats F5 as a hard lockout error rather than a soft warning.