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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I'm working on a trane furnace and my pressure switch reads

Customer Question

Hi I'm working on a trane furnace and my pressure switch reads error flashes 3x. I replaced it with new factory one. I also cleaned all the tubes and water is flowing. When I shut it off and turn it back on I have to turn the on and off switch to make it come on can you tell me what might be the issue
Submitted: 1 year ago.
Category: HVAC
Expert:  airheatman replied 1 year ago.

Have you checked intake and exhaust for blockage.Even a spider web in them can cause pressure switch not to close.

Customer: replied 1 year ago.
Customer: replied 1 year ago.
I did that cleaned all the hoses and trap
Expert:  airheatman replied 1 year ago.

Do you have a meter to check vacuum in water column to see id inducer is pulling adequate vacuum based on label on switch?