Testing Furnace Gas Control Valve

If the appliance is a boiler or furnace it ll use 24 vac to operate the main valve.

Testing furnace gas control valve.

I will be checking various gas valves to see if you can check the continuity of the solenoid with an ohmmeter. Set the thermostat or the device s controller slightly above the current room temperature. Standing pilot gas valves. The ignitor will be 120 volts the gas valve is most likely 24 see if your transformer shows voltage on the secondary terminals.

Turn off the gas feed line valve to the dryer. Step 1 check for coil burnout. If solenoid valves are malfunctioning dangerous pressure might build up and cause damage. The difference is the standing pilot gas furnace always has a pilot light on.

Turn off the furnace at the wall control. Standard solenoid valves are used for pneumatic gases. How to check the furnace gas valve with a multimeter step 1. Everything that applies to the electronic ignition sequence of operation by the way of the safety circuit must be proven before the gas furnace will allow the gas valve to fire the main burners to provide heat.

If so and the boiler or furnace isn t firing up then you need a new gas valve. If replacing the thermopile doesn t work then you need a new gas valve. Check to see if you re getting 24 vac at the terminals on the gas valve. Pull the wires off.

Adjust pilot flame as necessary to make sure the thermocouple is getting enough heat. Wait for the unit to cool if it has been in use. Some gas valves cannot be checked with an ohmm. There are four possible reasons for solenoid valves malfunction.

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. Most gas dryers have pullout snap panels. 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.

There should not be a flame up there if the valve is working correctly. Locate the gas valve. Locate the front lower access panel to the appliance. If you do get voltage then i would be testing for gas pressure before the gas valve and the manifold pressure when the gas valve has voltage.

Turn off the gas supply valve to your appliance to test whether your valve is capable of shutting down properly. The following steps will show you how to troubleshoot gas control valve solenoids.