Locate the gas valve mechanism which looks like a small metal device that has two coils attached to it.
Test furnace gas valve.
How to check the furnace gas valve with a multimeter step 1.
Pull the wires off.
Sweep out any hair lint and foreign debris with a feather duster.
This one shows how to do a voltmeter check of the gas valve.
Take out the bolts in the service panel on the side of the furnace using a nut driver.
Turn off the furnace at the wall control.
Have an assistant plug in the appliance and turn on the gas feed valve.
This one covers a simple way to find out if the gas valve is being energized on the newer gas furnaces.
I will be checking various gas valves to see if you can check the continuity of the solenoid with an ohmmeter.
Some gas valves cannot be checked with an ohmm.
Have the assistant set the dryer for high heat and turn the dryer on.
Locate the gas valve.