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Old 11-05-2006, 10:07 AM   #1
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thermostat locked on to a temp


I have a 4 year old Heil 90 Series forced air furnace with a possible problem in the thermostat. It (furnace) is not flashing any fault codes. The blower fan will not run in the auto mode. I ran an ignition start procedure which met with negative results. The thermostat is locked onto a temperature and can not be adjusted. Would this be a thermo?


Last edited by tdean63; 11-05-2006 at 02:29 PM. Reason: missing info
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Old 11-05-2006, 04:52 PM   #2
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thermostat locked on to a temp


Hi tdean63

It could possibly be a thermostat problem, but to determine that we will need a little more information. What make and series of thermostat do you have. If it is a digital try taking the batteries out of it and letting it bleed down. Let us know and one of us will try and walk you through it.

Good luck
Ruty

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Old 11-06-2006, 08:34 PM   #3
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thermostat locked on to a temp


Had an HVAC tech come out today and they said it was the computer board. They ran a check on thermo and it was fine, so it wasn't that.

Has there been problems on 2004 Heil furnaces (90 series) with the computer boards? Please advise..it doesn't make sense to have that on a new furnace like that.
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Old 11-06-2006, 10:09 PM   #4
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thermostat locked on to a temp


Hi tdean63

Do you have the part # for the replacement board? If you do I can find out for you what problems have been incountered. I can also find out rather or not they have addresed it in the newer versions. let me know and I will find out for you.


Thanks
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Old 11-07-2006, 09:01 AM   #5
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thermostat locked on to a temp


The furnace model is a Heil SN # N9M2100F1481 Manufactured 5/2004.

The circuit board is a honeywell with the following ID number on it ST9160B-1084

Thanks for the help!
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Old 11-07-2006, 10:55 AM   #6
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thermostat locked on to a temp


Hi tdean63

I did a little research this morning to see what I could find out. This board would appear to be pretty reliable. Some thing to watch for though, make sure furnace has a good earth ground, make sure water does not get onto the board. The other part of the equation is this is an inexpensive board. Should have cost you around $50.00. If you have to replace it again the part # is 1014460. Hope this helps, have a safe and warm winter.

Rusty
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Old 11-07-2006, 11:58 AM   #7
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thermostat locked on to a temp


appreciate the research, fortunately it's a warranty part.

we should be up and going this afternoon.

thanks

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