Testing Furnace Gas Valve

Locate the pressure tap on the gas valve and unscrew the plug.

Testing furnace gas valve.

This video is part of the heating and cooling series. The manometer will give the reading in water column in inches. Locate the hot surface igniter and look for a spark or glow there. Pull the wires off.

Videos you watch may be added to the tv s watch history and influence tv recommendations. Lastly a low voltage can be the problem for its failure to open. Wait for the unit to cool if it has been in use. Unplug the appliance from the wall outlet.

If playback doesn t begin shortly try restarting your device. Set the thermostat or the device s controller slightly above the current room temperature. 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. How to check the furnace gas valve with a multimeter step 1.

Disassemble the valve and clean it out with a brush or rag. If this doesn t work read the nameplate mopd rating. A simple measurement will tell you if your valve is bad or another part keeping voltage from the. Turn off the gas supply valve to your appliance to test whether your valve is capable of shutting down properly.

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

Turn on the furnace and start it. Turn off the gas feed line valve to the dryer. Turn off the furnace at the wall control. Then screw in your manometer.

Turn the gas back on. Locate the front lower access panel to the appliance. Turn the gas off. The ratings listed must align with the pressure rating shown on the valve.

Great video troubleshooting this goodman furnace gas valve.