Frigidaire Microwave Error Code F10

The F10 error code on a Frigidaire microwave indicates that the electronic control board has detected a potential runaway oven condition, meaning the appliance is registering temperatures that suggest uncontrolled or excessive heating. This code is tied to two primary components: the RTD (Resistance Temperature Detector) sensor probe, which monitors internal cavity temperature and sends resistance-based readings to the control board, and the relay circuit on the Electronic Oven Control (EOC) board itself. When either of these fails, the control interprets the incoming data as a dangerous overheating situation and triggers the F10 fault.

The RTD sensor probe is a common failure point. As the probe ages or sustains damage, its resistance values can shift outside the expected range, causing the control board to misread cavity temperatures as dangerously high even when the microwave is operating normally or is completely cold. A shorted relay on the EOC board is the other primary cause. If a relay on the board fails in a closed position, it can allow continuous power delivery to the magnetron or heating element, producing a genuine runaway heating condition rather than a false reading.

Diagnosis begins with inspecting and testing the RTD sensor probe. If the probe tests within spec and the oven is actually overheating, the problem points strongly to a shorted relay on the EOC. In a confirmed overheating scenario, power must be disconnected immediately. If the overheating resumes when power is restored after an RTD replacement, the EOC board requires replacement. Attempting to operate the unit while overheating persists creates a fire and safety hazard.