Testing Furnace Gas Valve

Locate the front lower access panel to the appliance.

Testing furnace gas valve.

The ratings listed must align with the pressure rating shown on the valve. If playback doesn t begin shortly try restarting your device. This video is part of the heating and cooling series. How to check the furnace gas valve with a multimeter step 1.

Turn off the furnace at the wall control. This one covers a simple way to find out if the gas valve is being energized on the newer gas furnaces. Then screw in your manometer. Unplug the appliance from the wall outlet.

Take out the bolts in the service panel on the side of the furnace using a nut driver. Locate the hot surface igniter and look for a spark or glow there. A simple measurement will tell you if your valve is bad or another part keeping voltage from the. Set the thermostat or the device s controller slightly above the current room temperature.

Screw back in the gas valve plug using a small amount of pipe dope. Turn on the furnace and start it. Locate the gas valve. Some gas valves will have a pressure tap on both sides while some only have one on the furnace manifold side.

Locate the pressure tap on the gas valve and unscrew the plug. Turn the gas back on. Turn the gas off. If this doesn t work read the nameplate mopd rating.

Lastly a low voltage can be the problem for its failure to open. The manometer will give the reading in water column in inches. Wait for the unit to cool if it has been in use. Disassemble the valve and clean it out with a brush or rag.

Videos you watch may be added to the tv s watch history and influence tv recommendations. This valve is usually found in the wall line leading to the dryer and is shut off by turning the handle perpendicular to the gas line. A solenoid valve that is filled with drudge might fail to open. There should not be a flame up there if the valve is working correctly.

Great video troubleshooting this goodman furnace gas valve.