Troubleshooting Gas Furnace Pressure Switch

The first step is to examine the control board and check if the switch is stuck due to an obstacle in its path. The pressure switch is an indicator of pressure problems in the furnace. 102 thoughts on how to test and troubleshoot gas furnace pressure switches.

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The source of pressure switch problems can sometimes be a pain to track down.

Troubleshooting gas furnace pressure switch.

It should be clear. Other problems that could cause the pressure switch to not open are a dirty blower wheel on the inducer. Remove the pressure switch wires turn the furnace on the draft inducer fan motor will begin to run as air is pushed out of the vent a vacuum is created which should cause the switch to close. Also the fittings that the tubing fit into should be clear.

Here s how you can fix a stuck gas furnace pressure switch. How do i know if i have gas furnace pressure switch problems. Furnace pressure switch troubleshooting. Replaced the flame sensor it didn t fix the problem and it is very difficult to access on this unit.

The switch is connected to hoses and the water in these can sometimes cause a little bit of a problem. Check the tubing from the inducer. If the multimeter does not show any sign of. The pressure switch fitting may have a restrictor inside do not remove.

Checked the resistance on the two vacuum sensors on the firebox blower. Which is why i made this video that go. Step 1 inspect the control board. Checked the limit switch all ok.

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