GE Oven Error Code Lower Thermal Sensor OPEN

This error means the control board cannot detect a valid resistance signal from the lower oven thermistor, indicating an open circuit in the sensor loop. The thermistor should measure approximately 256K ohms at room temperature between its red and white wires. When the circuit reads as open, the oven cannot monitor cavity temperature and disables heating to prevent a safety hazard. The fault points to a broken thermistor, damaged wiring, or a loose connector.

No, you should not attempt to use the oven while this error is active. Without a functioning lower thermistor, the control board cannot regulate oven temperature, which creates a risk of overheating. Continuing to operate the oven in this condition could damage other components and presents a fire hazard.

Resetting the oven by cutting power at the breaker for a few minutes may temporarily clear the error code, but it will return as soon as the control board runs its diagnostic cycle again if the underlying fault has not been fixed. The open circuit in the sensor loop is a hardware problem that cannot be resolved by resetting alone. Clearing the code without repairing the fault will not restore normal oven operation.

A knowledgeable DIYer can perform the initial diagnosis by disconnecting the thermistor and measuring resistance across the red and white wires with a multimeter. If the sensor reads OL (infinite resistance) rather than near 256K ohms at room temperature, replacing the thermistor is a straightforward repair involving disconnecting two wires and a mounting screw. If the sensor tests correctly, tracing and repairing the harness is more involved and may benefit from professional assistance.

If only the thermistor needs replacement, parts typically range from $20 to $60 depending on the model, and a professional repair including labor can run between $100 and $200. If the wiring harness is damaged, repair costs will vary based on the extent of the damage. A control board replacement, needed in rare cases, is the most expensive outcome and can range from $150 to $400 or more for parts and labor.