GE Range Error Code ER 12

ER 12 indicates a fault in the MTwisT control system where the relay port pin state does not match the software register value stored on the control board. This means the board's hardware outputs and internal software tracking are out of sync. The range flags this as a fault and stops normal operation to prevent unpredictable behavior from the heating element relays.

No, the range should not be used while displaying ER 12. The fault indicates the control board cannot reliably track the state of its relay outputs, which means heating elements could behave unpredictably. Continuing to operate the range under this condition creates a risk of overheating or elements not shutting off as commanded.

If the fix requires a control board replacement, parts alone typically range from around 150 to 400 dollars depending on the specific model, with professional labor adding another 100 to 200 dollars. If the error is caused by a loose wiring connection, the repair cost is minimal. Getting a diagnosis from a qualified technician before purchasing parts is advisable, since control boards are generally non-returnable once installed.

A hard power reset, by shutting off the circuit breaker for one to two minutes and then restoring power, can clear ER 12 if the fault was caused by a transient power event or temporary voltage irregularity. If the error returns immediately or shortly after the reset, the control board likely has a persistent internal failure that requires further diagnosis or replacement. A reset alone will not fix an underlying hardware fault.

Start by performing a full power reset at the circuit breaker for at least one to two minutes. If the error clears and does not return, monitor the range for recurrence. If the error persists, inspect all wiring harness connections at the control board for corrosion or looseness. A persistent ER 12 that does not clear with a reset typically requires replacement of the MTwisT control board.