Troubleshooting Gas Furnace Pressure Switch

It should be clear.
Troubleshooting gas furnace pressure switch. Replaced the flame sensor it didn t fix the problem and it is very difficult to access on this unit. Check the tubing from the inducer. The source of pressure switch problems can sometimes be a pain to track down. The switch is connected to hoses and the water in these can sometimes cause a little bit of a problem.
Also the fittings that the tubing fit into should be clear. Checked the resistance on the two vacuum sensors on the firebox blower. Checked the limit switch all ok. Other problems that could cause the pressure switch to not open are a dirty blower wheel on the inducer.
The pressure switch fitting may have a restrictor inside do not remove. Furnace pressure switch troubleshooting. 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. Step 1 inspect the control board.
How do i know if i have gas furnace pressure switch problems. 102 thoughts on how to test and troubleshoot gas furnace pressure switches. 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.