Testing Furnace Gas Valve

This video is part of the heating and cooling series.

Testing furnace gas valve.

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 the gas back on. Locate the gas valve.

Turn on the furnace and start it. Turn the gas off. Turn off the gas feed line valve to the dryer. 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.

Then screw in your manometer. Wait for the unit to cool if it has been in use. Lastly a low voltage can be the problem for its failure to open. 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. If this doesn t work read the nameplate mopd rating. Disassemble the valve and clean it out with a brush or rag. Set the thermostat or the device s controller slightly above the current room temperature.

Locate the pressure tap on the gas valve and unscrew the plug. The ratings listed must align with the pressure rating shown on the valve. This one covers a simple way to find out if the gas valve is being energized on the newer gas furnaces. If playback doesn t begin shortly try restarting your device.

How to check the furnace gas valve with a multimeter step 1. Pull the wires off. A simple measurement will tell you if your valve is bad or another part keeping voltage from the. The manometer will give the reading in water column in inches.

Locate the front lower access panel to the appliance. Unplug the appliance from the wall outlet. Great video troubleshooting this goodman furnace gas valve. Locate the hot surface igniter and look for a spark or glow there.

Take out the bolts in the service panel on the side of the furnace using a nut driver.