GE Range Error Code SUPPLY OPEN NEUTRAL

The SUPPLY OPEN NEUTRAL error on a GE range is triggered by the appliance's internal power monitor when it detects that the L1-to-neutral voltage has dropped below 90VAC. In a properly functioning 240VAC residential circuit, the neutral conductor balances the two hot legs (L1 and L2), and each leg should measure approximately 120VAC to neutral. When the neutral connection is lost or severely degraded, this voltage balance collapses, causing one or both legs to read abnormally high or low relative to neutral. The range detects this condition and displays the error to prevent damage to sensitive electronics and heating components.

The most common source of an open neutral is a failed or loose connection at the range's terminal block, where the incoming supply wires attach to the appliance. Over time, these connections can loosen due to thermal cycling, corrosion, or improper torque during installation. An open neutral can also originate further upstream at the wall receptacle, the branch circuit wiring, or even at the main electrical panel where the neutral bus connection may have failed. A broken neutral wire within the conduit or cable run is less common but possible, particularly in older homes with aluminum wiring.

This condition is a genuine electrical supply problem, not a range component failure. The appliance itself is reporting what it measures at the input terminals. Diagnostics should begin at the terminal block on the range, then work upstream toward the panel. A multimeter is required to confirm voltages at each point. Because open neutral conditions can produce overvoltage on one leg, the range should not be operated until the fault is corrected.