Furnace Gas Valve Pressure Test

Using a meter test if the switch closes.

Furnace gas valve pressure test.

To test the pressure switch use a multi meter and measure the continuity of the switch as it opens and closes. Pull the wires off. To do this the pressure switch wires are removed and the furnace turned on. Turn off the furnace at the wall control.

Screw back in the gas valve plug using a small amount of pipe dope. 52 61 good unit by just another buyer worked great for checking gas flow on a couple heaters that we have. The pressure switch on a furnace may fail or get stuck in an open position and there are few simple checks you can complete before testing the switch. Testing a gas line for leaks do it yourself how to fix a leaky gas valve and pressure testing on home natural gas lines gas company wont turn on my gas due t.

Take out the bolts in the service panel on the side of the furnace using a nut driver. Gas pressure test kit top selected products and reviews yellow jacket 78060 complete test kit 0 35 w c by yellow jacket ritchie in stock. Basically the switch needs to be tested to see if it is closing when the pressure diaphragm pulls in. A multimeter will be needed to test the switch for continuity.

The manometer will give the reading in water column in inches. Locate the pressure tap on the gas valve and unscrew the plug. Turn the gas off. A pressure switch is designed to sense the negative pressure created by the draft inducer motor during the furnace startup and to shut down the furnace ignition if the air pressure is inadequate.

How do you test the gas furnace pressure switch. Some gas valves will have a pressure tap on both sides while some only have one on the furnace manifold side. Turn gas on and. The gas valve will have a pressure tap located on it.

Wait for the unit to cool if it has been in use. Turn the gas back on. Locate the gas valve.