Testing Furnace Gas Valve

This video is part of the heating and cooling series.

Testing furnace gas valve.

This one covers a simple way to find out if the gas valve is being energized on the newer gas furnaces. Turn off the gas feed line valve to the dryer. How to check the furnace gas valve with a multimeter step 1. Turn the gas back on.

Locate the hot surface igniter and look for a spark or glow there. Turn off the furnace at the wall control. Locate the gas valve. If this doesn t work read the nameplate mopd rating.

Turn the gas off. Some gas valves will have a pressure tap on both sides while some only have one on the furnace manifold side. Take out the bolts in the service panel on the side of the furnace using a nut driver. Pull the wires off.

Unplug the appliance from the wall outlet. Lastly a low voltage can be the problem for its failure to open. There should not be a flame up there if the valve is working correctly. The ratings listed must align with the pressure rating shown on the valve.

Turn off the gas supply valve to your appliance to test whether your valve is capable of shutting down properly. A solenoid valve that is filled with drudge might fail to open. Locate the front lower access panel to the appliance. 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. 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. A simple measurement will tell you if your valve is bad or another part keeping voltage from the.

Screw back in the gas valve plug using a small amount of pipe dope. Locate the pressure tap on the gas valve and unscrew the plug. If playback doesn t begin shortly try restarting your device. The manometer will give the reading in water column in inches.

Great video troubleshooting this goodman furnace gas valve.