Error code reference

GE Microwave Error Code F-3

Key Short Error

Key Short Error - indicates a short circuit detected in the key panel.

First step from the service manual

Perform Key Panel Test by measuring resistance between terminal pins of the KEY CONNECTOR.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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Step-by-step tests with expected resistance, voltage, and continuity values
Wiring diagram references and connector pinouts from the OEM service manual
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F-3 on my GE Microwave

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Key Short Error - indicates a short circuit

From Service Manual 850865, p.37:

1.Perform Key Panel Test by measuring resistance between terminal pins of the KEY CONNECTOR.

2.Measure control board supply voltage at the test points. Expected: 12 VDC and 5 VDC; a drop below 4.75 VDC on the logic rail points to a failed onboard regulator.

3.Inspect all connectors on the main control for corrosion, thermal stress, or backed-out pins. Reseat each connector with the power disconnected.

Part WR55X10942

Main control board

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First step from the service manual

Get the full diagnostic procedure for F-3.

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