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Error code reference
GE Microwave Error Code Upper Thermal Sensor OPEN
The upper thermal sensor circuit is open, indicating a broken or disconnected upper thermistor (blue and white wires).
SourceGE Advantium 120V (ATC) - Full Service Manualp. 69
Diagnostic procedure
The full Upper Thermal Sensor OPEN procedure
Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.
MyPros+ · DiagnosticsStep 1 preview
1
First diagnostic step
Check resistance between blue and white wires of the thermistor; should be 100K ohms at room temperature.
SourceGE Advantium 120V (ATC) - Full Service Manualp. 69
More steps, wiring diagram references, and verified part numbers
Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.
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Where this code is documented
8 manuals in the MyPros+ library document this code for GE microwave.
Models covered by the manuals that document this code
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