GE Range Error Code C4

The C4 code on a GE range means the main control board has detected a communication failure with the auxiliary relay board. The auxiliary relay board manages relay-switched circuits for cooking functions, and when communication is lost, the range triggers this fault. The issue can stem from a faulty wiring harness, a bad connector, or a failed board.

Unplugging the range for a few minutes and restoring power may temporarily clear the C4 code, but if an underlying wiring or board problem exists, the code will return. A reset alone does not repair a faulty harness connection or a failed auxiliary relay board, so the root cause still needs to be diagnosed and corrected.

Repair costs vary depending on what component has failed. If the fix is simply reseating a loose connector, there may be no parts cost, though a service call fee typically applies and can range from around $75 to $150. If the auxiliary relay board or main control board requires replacement, parts can add anywhere from $100 to $350 or more to the total repair bill, depending on the specific model.

A knowledgeable DIYer can start by unplugging the range and inspecting the wiring harness and connectors between the main control board and the auxiliary relay board. If connectors are loose, reseating them may clear the fault. If the harness is damaged or a board needs replacement, the repair becomes more involved and may be better suited for a qualified technician.

A C4 error means the range has lost communication with a board that controls relay-switched cooking circuits, which can cause unpredictable operation of burners or oven elements. Continuing to use the range in this state is not recommended, as the relay board may not respond correctly to control commands. The range should be taken out of service until the fault is resolved.