A.O. SMITH PROMAX / POWER VENT GAS SERIES Water Heater Gas Control Valve Clicking

Gas Control Valve (Thermostat/Regulator)

The gas control valve contains the electromechanical solenoids and the control logic that governs gas flow. In A.O. Smith units, a persistent clicking sound without burner ignition indicates an internal failure where the solenoid is unable to stay energized or the internal relay is stuck in a cycle. This is a common failure mode in the electronic Honeywell-style valves often used by this brand.

SKU: 100262939

Pilot Assembly with Thermopile/Thermocouple

The gas valve requires a specific millivolt signal from the thermopile to hold the solenoid open. If the pilot flame is weak or the thermopile is failing, the valve will repeatedly click as it attempts to engage and then immediately drops the connection for safety when it fails to detect a stable flame signal.

FVIR Thermal Switch Kit

If the Flammable Vapor Ignition Resistant (FVIR) sensor has been triggered or is failing, it interrupts the circuit to the gas valve. This can cause the control logic to cycle the solenoid (clicking) as it attempts to verify the safety circuit before allowing gas flow to the main burner.