GE Oven Error Code SUPPLY MISWIRED

SUPPLY MISWIRED is a power monitor error indicating that the oven's control board has detected abnormal voltage relationships on the incoming 240VAC supply. Specifically, it triggers when L1-to-L2 voltage is below 90VAC while L1-to-neutral is between 90VAC and 150VAC at power-up, or when L1-to-neutral exceeds 150VAC after power-up. The oven shuts down to protect its electronics. This is a wiring problem in the supply circuit, not an internal component failure.

No. The oven displays this error specifically because the incoming power is outside safe operating parameters. Using the oven under these conditions risks damage to the control board and other electronic components, and the underlying wiring problem may also present a shock or fire hazard. The supply wiring must be corrected before operating the oven.

If the fix is simply reconnecting wires at the terminal block, the cost may be minimal, covering only a service call fee in the range of $75 to $150 if a technician performs the work. If the power cord needs replacement, cord costs typically range from $15 to $50 depending on wire gauge and configuration. If the problem originates at the electrical panel or requires new wiring, electrician labor and materials could bring the total to $150 to $400 or more depending on the scope of the repair.

If you are comfortable working with 240VAC wiring and can safely use a voltmeter, you can begin by checking the wire terminations at the oven's terminal block to confirm L1, L2, and neutral are on their correct terminals. If you have a plug-in range, inspect the power cord connections at both the plug and the terminal block. Any work inside the electrical panel should be performed by a licensed electrician, as exposed panel wiring carries lethal voltage even with the range breaker off.

Resetting the oven by cycling the breaker will temporarily clear the error, but it will return immediately if the underlying wiring problem has not been corrected. Because the control board checks supply voltage during power-up and continuously during operation, any abnormal voltage condition will retrigger the fault. The wiring must be corrected first.