Testing Furnace Gas Control Valve

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.

Testing furnace gas control valve.

Turn off the furnace at the wall control. 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. There are four possible reasons for solenoid valves malfunction. Wait for the unit to cool if it has been in use.

Take out the bolts in the service panel on the side of the furnace using a nut driver. If replacing the thermopile doesn t work then you need a new gas valve. The difference is the standing pilot gas furnace always has a pilot light on. 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.

How to check the furnace gas valve with a multimeter step 1. If the appliance is a boiler or furnace it ll use 24 vac to operate the main valve. Some gas valves cannot be checked with an ohmm. Turn off the gas supply valve to your appliance to test whether your valve is capable of shutting down properly.

Even though these systems are generally built to last gas furnace valves are the parts more likely to need replacement over the life of the furnace. Locate the hot surface igniter and look for a spark or glow there. If so and the boiler or furnace isn t firing up then you need a new gas valve. Turn off the gas feed line valve to the dryer.

If solenoid valves are malfunctioning dangerous pressure might build up and cause damage. There should not be a flame up there if the valve is working correctly. Coil burnout failure to open failure to close or solenoid valve noise. Most gas dryers have pullout snap panels.

Pull the wires off. Set the thermostat or the device s controller slightly above the current room temperature. Standard solenoid valves are used for pneumatic gases. The ignitor will be 120 volts the gas valve is most likely 24 see if your transformer shows voltage on the secondary terminals.

Step 1 check for coil burnout. I will be checking various gas valves to see if you can check the continuity of the solenoid with an ohmmeter. The following steps will show you how to troubleshoot gas control valve solenoids. Adjust pilot flame as necessary to make sure the thermocouple is getting enough heat.

Locate the front lower access panel to the appliance. Standing pilot gas valves.