What This Error Means

The furnace control detected an abnormal gas-valve circuit condition. The official fault category includes a valve that is not energized when required or a gas-valve relay that is stuck closed.

Symptoms You May Notice

No ignition; furnace shutdown; repeated fault; gas valve may fail to open; control may detect an abnormal valve signal even when there is no normal heat cycle.

Common Causes

Failed gas-valve coil; stuck control-board relay; loose connector; shorted or open wiring; damaged integrated furnace control; low-voltage power problem.

Safe Troubleshooting Steps

1. Turn off power and close the manual gas valve. 2. Inspect the valve connector and wiring. 3. Do not repeatedly reset the furnace. 4. A qualified technician should test valve-coil resistance, check for correct command voltage, verify the relay opens and closes correctly and confirm the valve is not leaking or passing gas when de-energized. 5. Replace the failed valve or control and perform leak and combustion testing.

Parts Commonly Involved

Gas valve; integrated furnace control; gas-valve relay; transformer; wiring and connectors.

When to Call a Technician

Yes, immediately.

Safety Notice

Gas-valve faults require trained service. Shut off power and gas if valve operation appears abnormal or gas odor is present.

Manufacturer Documentation