Gas Valve Function
The gas valve controls fuel flow to the burners. Modern gas valves are controlled by 24V signals from the control board and include safety shutoffs.
Failure Symptoms
- No gas flow to burners
- Gas smell without ignition
- Weak or inconsistent flame
- Valve won't open or close
Testing Procedure
- Verify 24V signal from control board
- Check gas pressure at inlet and outlet
- Listen for click when valve energizes
- Measure coil resistance with multimeter
Safety Warning
Gas valve work involves combustible fuel. If you smell gas, leave immediately and call your gas company. Always verify proper venting after service.