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Page 1 GAS VALVE SOLENOID CHECK STEP 1. Make sure the manual control located on the gas valve is in the “ON” Position. STEP 2. With the thermostat calling for heat, the induced draft motor operating and the pressure switch closed, check for 24 volts at the gas valve solenoid terminals (fig. 1,2) If the gas valve is a two stage model, check voltage to the second stage solenoid by initiating a second stage call for heat by jumpering fig. 1 the second stage heat thermostat terminal at the IFC. If there is no voltage, be sure the induced draft motor has closed the vent pressure switch contacts. (second stage pressure switch for second stage solenoid.) fig. 2 Page 2 STEP 3. If 24 volts is not present at the gas valve solenoid terminals, check for voltage at the IFC (INTEGRATED FURNACE CONTROL) board terminals that feed 24 volts to the gas valve solenoid (fig 3.) If there is voltage at the control board but not at the gas valve, check for a lose or broken wire, or an open safety fig. 3 circuit. If there is no voltage at the appropriate control board terminals, Replace the control board. STEP 4. If 24 volts is present at the gas valve solenoid, but the gas valve does not open, The gas valve is defective and must be replaced.