Testing Furnace Pressure Switch

Hook a manometer to the tubing and check the draft from the heat exchanger in inches w c. Turn off the power to the furnace by switching off the disconnect switch located near the furnace. To do this the pressure switch wires are removed and the furnace turned on.

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Set your meter to volts ac turn your furnace on so it is calling for heat.

Testing furnace pressure switch.

A multimeter will be needed to test the switch for continuity. To test the pressure switch use a multi meter and measure the continuity of the switch as it opens and closes. With a manometer or magnahelic. The pressure switch has a pressure at which it closes which is typically negative.

Ensure the draft is above the required pressure. If you see anything clean it out. How do you test the gas furnace pressure switch. A multimeter is used to test the pressure switch and check the continuity of the switch whether it is closed or it is opened.

If there is no disconnect. Inspect the pressure switch hose. The steps are as follows. Check for obstructions in the hose.

The switch wires have to be removed first. The draft inducer should start. Turn off the power. Basically the switch needs to be tested to see if it is closing when the pressure diaphragm pulls in.

Probe one lead of the pressure with one lead of your meter while touching the other lead of your meter to. There should be either two or three wires going into your pressure switch. The switch is being tested to check if it s closing when the diaphragm is pulled in.

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