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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I have an old residential Trane model BLU108F936B1 that will

Customer Question

Customer: I have an old residential Trane model BLU108F936B1 that will ignite a spark to get the pilot flame. Then after a little while the gas ignites the much larger flame at the burner/chamber area. Then after a little while the blower / fan kicks on and heat can be heard going up into the vents and through the house. The problem however, is that it only stays on at this point for maybe a minute or so, then shuts off. It will keep starting, but it wont stay on long enough to heat the house, which is pretty cold at about 70 degrees and the wall thermostat set at 82 degrees. Sir what's happening here. Thanks!
JA: Thanks. Can you give me any more details about your issue?
Customer: The full description of the problem is stated Sir, as best I have observed.
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Submitted: 1 year ago.
Category: HVAC
Expert:  Rick replied 1 year ago.

Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. If my initial response doesn’t answer your question then let me know and we can continue our conversation.

The first thing to try is to connect the R & W terminals on the thermostat terminal strip (where the thermostat wires connect) at the furnace. If the heat stays on you have a thermostat or thermostat wiring problem.

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