GE Microwave Error Code OPEN STEAM SENSOR

This error means the control board has detected an open circuit in the humidity sensor loop, so it cannot receive moisture readings from the sensor. The cause may be a failed sensor, an unplugged connector, damaged wiring, or a problem with the smart board. GE provides a built-in diagnostic mode accessed by holding pads 7 and 8 simultaneously to help narrow down which component is at fault. A diagnostic value of 213 or higher confirms the circuit is open at the sensor, wiring, or smart board level.

When the OPEN STEAM SENSOR error is active, the microwave cannot use its sensor cooking functions accurately, as it has no valid humidity data to work with. Basic timed cooking may still be available, but auto-sensor modes should not be relied upon. It is best to resolve the fault before regular use to avoid improperly cooked food or further potential issues with the control system.

Repair costs vary depending on which component has failed. A replacement humidity sensor typically falls in the range of $20 to $60 for the part alone. If the smart board requires replacement, parts can range from $80 to $200 or more depending on the model. Adding professional labor, total repair costs generally run between $100 and $300, though complex cases involving wiring repairs or hard-to-source boards may cost more.

Some causes, such as a loose or disconnected sensor connector, can be corrected without replacing any parts if you are comfortable accessing the interior components of the microwave. However, microwave capacitors store high voltage even when unplugged, so internal repairs should only be attempted by those with appliance repair experience. If the sensor or smart board needs replacement, those parts require careful handling and proper reconnection to restore correct operation.

Unplugging the microwave or cycling the breaker may temporarily clear the displayed error, but the fault will return if the underlying cause is not corrected. The open circuit in the humidity sensor path is a hardware issue, and the control board will detect it again during the next sensor cooking cycle or self-check. A proper repair of the sensor, wiring, or smart board is required for a permanent resolution.