Testing Furnace Gas Control Valve

How a furnace gas valve works. Gas valve troubleshooting gas valves used in a modern state of the art residential gas furnaces are typically controlled via a state of the art electronic ignition control or a printed circuit board. This video is part of the heating and cooling series.

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Standard solenoid valves are used for pneumatic gases.

Testing furnace gas control valve.

This video is part of the heating and cooling series of training videos made to accompany my web. This one covers a simple way to find out if the gas valve is being energized on the newer gas furnaces. There are also gas valves located within gas powered hot water systems or fireplaces. Gas valves can be found on gas furnaces gas fired steam boilers or hot water boilers and gas fired water heaters.

When you look at a gas valve imagine two valves in series. Set the thermostat or the device s controller slightly above the current room temperature. Locate the hot surface igniter and look for a spark or glow there. There are essentially two valves that make up your furnace s gas valve and they are positioned in series or one after the other.

This one shows how to do a voltmeter check of the gas valve. The gas port where the tube to the pilot light connects is between the two valves so that gas can flow to the pilot light as long as the first valve or safety valve is open. Turn off the gas supply valve to your appliance to test whether your valve is capable of shutting down properly. Testing gas pressure at the valves is often the first thing hvac technicians do when they are called in to check on faulty furnaces.

Even though these systems are generally built to last gas furnace valves are the parts more likely to need replacement over the life of the furnace. Furnace gas valves are only seen on gas fueled forced air furnaces or gas powered boilers. There should not be a flame up there if the valve is working correctly. Furnace gas valves are wired to an electronic component known as a solenoid which receives signals from the thermostat control.

This causes the gas valve to widen or narrow in front of the pilot light to respond to changes in building temperature. If the second valve or main valve is open it can also flow to the burner trays. Other types of gas valves include the standing pilot gas valve.