furnace won't turn on for heat - http://www.hvacmechanic.com/ Forums
Original message
| Norm Jr
 |  "furnace won't turn on for heat"
, posted Tue 14 Oct 16:20  
I have an old tappan gas fired forced hot air furnace. I am able to run my a/c and the fan. But when i call for heat it wont turn on. The pilot is lit ( not electronic pilot ). I had the transformer checked and it is fine. Unsure what else could be the issue. Any advice is more than appreciated
Norm
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Replies:
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| amech
| "Re(1):furnace won't turn on for heat" , posted Tue 14 Oct 19:45
First verify that the thermostat is calling for heat. If you have 24v between W & C or 0v between R & W then you have an open safety limit or bad gas valve. Oterwise you have a bad thermostat or control wiring. FYI, W,R,C terminals are located at furnace.
Hope this helps.
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| | MnGuy
| "Re(2):furnace won't turn on for heat" , posted Thu 16 Oct 23:31
I switched out the thermostat and nothing happened and I also bypassed the thermostat.... still nothing.
There are 2 terminals on top of the gas valve, are those the ones to check? In the morning I will check the voltage (low).
This seems like it should be something relatively simple... but it is VERY frustrating as I need it to be heating.
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