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We have a trane gas furnace (xr-90). our blower was on

Customer Question
We have a trane...

We have a trane gas furnace (xr-90). our blower was on continuously with no heat. the glo plugs came on but the burner did not. I tested the themostat for continuity on the R and G terminals and got continuity with the programable thermostat off and blower on auto. I also ran shorted out the red and yellow wire terminals at the control board and got the burner to light.

Contractor's Assistant: Did you double-check the thermostat's settings? And what about the filters?

We replaced the 4 wire programable thermostat with a simple 3 wire thermosat and the burner wont go out. the 4 wires exiting the wall are red, uyellow, green and black. the new themostat calls for red yellow and white wires. I connected the red and yellow to the correct teminals and the black wire to the white wire terminal. Im guessing this is not correct. We have a clean filter.

Contractor's Assistant: Do you plan on doing the work yourself?

I cleaned the ignitor and flame sensor with a with wire cloth. the condensator is free of debre.

Contractor's Assistant: Anything else we should know to help you best?

I am doing the repairs myself due to funds. sorry for the long story.

Submitted: 8 months ago.Category: HVAC
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Answered in 2 minutes by:
12/13/2017
HVAC Technician: BillyHvac, Journeyman HVAC Tech replied 8 months ago
BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 23,154
Experience: Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
Verified

Hello,

My name is Billy.

With thermostat off the wall....touch the red and yellow together and hold.

Tell me if furnace runs......

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