Error code reference
GE Microwave Error Code Lower Thermal Sensor OPEN
The lower thermal sensor circuit is detected as open, indicating a failed or disconnected lower thermistor.
The lower thermal sensor circuit is detected as open, indicating a failed or disconnected lower thermistor.
First step from the service manual
Check lower thermistor (red and white wires) resistance at Smart Board CN09; should be 256K ohm at room temperature.
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
- Verified part numbers when replacement is required
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