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Old 10-18-2009, 09:34 AM   #1
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Why does my furnice not turn on

im having problems with my trane furnice. I noticed there was no flame in the piolit so i chanced the thermocoupler. I dont know what do do next. My next idea was to change the thermostat, but the Aircondition turns on, but the heater doesnt. I can also turn the blower on and it works. For some reason the heater will not turn on. What could be the reason?


Last edited by MILTON; 10-18-2009 at 09:40 AM.
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Old 10-18-2009, 11:06 AM   #2
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If the furnace is less than ten years old, there is a led light on the control board. It will flash x number of times. The flashing light is a "tattle tale". somewhere on the board or the door panel, there is a legend that will indicate what the problem is by the number of flashes. At least that is a starting point in diagnosing the problem. There is no sense in replacing parts without having an idea what is wrong.

You mentioned a thermocouple. Is this an older furnace?


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