Tempstar Gas Furnace - Fan Always On

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Old 10-15-13, 08:24 AM
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Tempstar Gas Furnace - Fan Always On

Greetings!

I have a Tempstar gas furnace that was installed in 2007 and since 2012 we have been having issues with it working properly. It worked great all summer long with the limited amount of AC that we used but now it is time for heat and it is not working.

According to the diagnostic LED code (2 flashes) I have a low pressure switch closed when it should be open. I followed the rubber hose from the fan housing to the switch and cleaned the hose. Really it wasnt clogged at all. I tested the switch and it opens and closes with no issue.

The problem appears to be the fan is on all the time. If i switch the thermostat to Auto its on and if I turn it to ON its on. I have found that if I remove the hose from the switch for a second, wait for the diagnostic code to flash three times, indicating it is open when should be closed, and plug it back up it works. but only till that heating cycle is over and we are back to square one.

I think the issue is that the fan never stops. Also I noticed a reddish debris on the area where I put the filter. but this may be a secondary issue.

How can I fix the fan so that it shuts off when the cycle is complete?

Thanks in advance! Sorry so long....

Cheers!
 
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Old 10-15-13, 05:01 PM
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Your furnace probably has two fans.

One is a small fan that circulates the combustion gasses through the furnace called the inducer motor, and the other a large fan that circulates warm air through the house.

I'm supposing it's the inducer motor that's not shutting off. Is that correct?
 
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Old 10-16-13, 07:08 AM
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You are exactly correct. It is the small motor that circulates the gasses.
 
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Old 10-16-13, 12:27 PM
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Very likely the circuit board has a sticking relay that is not shutting off the inducer motor properly.


While the thermostat is not calling for heat and the inducer motor continues to run, try tapping gently on the circuit board/ignition control with the handle of a screwdriver and see if that jogs causes the inducer motor to shut off.

If so, replace the circuit board.
 
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Old 10-16-13, 01:16 PM
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Is there a specific relay I should tap or just tap everywhere?
 
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Old 10-16-13, 01:40 PM
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Just do some tapping to see if you free something up.
 
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Old 10-17-13, 07:14 AM
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Well I did some tapping and BLAMMO it is working perfect.

Thank you for your help! Im sure that something needs to be replaced in the future but for now im happy!


Thank You! Where do you live because I owe you a beer or two!
 
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Old 10-17-13, 11:36 AM
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Yes, the problem is likely to recur and to get worse, with the relay failing in the end.

The correct solution to the problem would be to replace the circuit board.
 
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