GE Oven Error Code Upper Thermal Sensor OPEN

This error means the control board cannot detect a signal from the upper oven thermistor, which monitors cavity temperature. The circuit between the thermistor and the board is open, meaning continuity has been lost. This is caused by a failed thermistor, a broken wire, or a disconnected connector. The oven will not function normally until the fault is resolved.

No, it is not safe or practical to operate the oven with this error active. The control board uses the upper thermistor signal to regulate oven temperature, and without that data it cannot prevent overheating. Using the oven in this condition risks uncontrolled temperature, food safety issues, and potential damage to the appliance. Resolve the fault before resuming use.

If the thermistor itself has failed, replacement thermistors for GE ovens typically cost between $20 and $60 for the part alone. If the problem is a damaged wiring harness, costs vary depending on whether a section of wire can be repaired or the full harness must be replaced. Professional repair labor generally adds $75 to $150 or more per hour depending on your area. If the control board is the cause, board replacement is the most expensive outcome, typically ranging from $150 to $350 or higher for the part.

Many homeowners and DIYers can resolve this error by inspecting and reseating wiring connectors or replacing the upper thermistor. The first step is to check resistance across the blue and white thermistor wires with a multimeter: a reading near 100K ohms at room temperature means the sensor is good, and the problem is in the wiring or connectors. If the thermistor reads open or infinite, replacing the thermistor is a straightforward repair. Always disconnect power to the oven before inspecting or replacing any components.

Resetting the oven by cutting power at the breaker for a few minutes may temporarily clear the error display, but it will return as soon as the control board attempts to read the sensor again. The underlying open circuit must be physically repaired or the faulty component replaced for the error to stay cleared. A reset is useful only for confirming whether a loose connector is the cause after you have reseated the connectors.