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airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 7996
Experience:  Furnace, A/C and heat pump specialist.
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Have Trane Tue080A948L3 furnace. Have 3 blink error code.

Customer Question

Have Trane Tue080A948L3 furnace. Have 3 blink error code. Replaced pressure switch
Replaced gasket for induced draft motor
Checked flue pipe clear
Any other things to check
Submitted: 1 year ago.
Category: HVAC
Expert:  airheatman replied 1 year ago.

Try this. Remove the rubber hose from inducer and leave attached to pressure switch. Call for heat and allow inducer to start,Then suck on hose and see if pressure switch closes and ignition takes place.

Customer: replied 1 year ago.
Then what is next step
Expert:  airheatman replied 1 year ago.

Did furnace work while sucking on hose?

Customer: replied 1 year ago.
Not there what if it starts is it inducer?
Expert:  airheatman replied 1 year ago.

Leaving office tonight.If you want to continue tomorrow,I will be around. If furnace comes on when sucking on hose, make sure vent is not blocked and no water in tubes. Next will be to remove the inducer and make sure blades are not broken or deteriorated and nothing inside like a small bird or debris.We will go from here.

Expert:  airheatman replied 1 year ago.

If all are clear we will need a vacuum tester to see how much vacuum the inducer is actually pulling on the switch