Posted by Buzzman72 on December 29, 2012 at 09:19:26 from (74.134.25.51):
When I got up to go to work yesterday, the furnace was working fine. By "furnace," I'm referring to the LP gas central heating unit in my utility room that heats the house. Brand name is Bard...which, I understand, stopped building furnaces in 1997. Mine is a 1996, model MPG100D48C.
In the past, I'd had a LOT of problems with the Honeywell controller...specifically, burning out the integral fan relay. A couple of years ago, Honeywell updated the original style controller with a new model, number ST9120U, and I'd not had another problem since...after having to replace the old style controller every 8 to 14 months after the first one went out.
When I got home from work yesterday evening, the wife told me that the furnace wasn't working. This time, the diagnostic LED on the controller isn't on at all...much less flashing a code.
Checked the LP tank...I have plenty of gas. [That wouldn't stop current from getting to the module anyway...but I figured someone would ask anyway.]
Checked the breaker...it's a double breaker in a single slot, and both tabs are marked "20"..and the breaker wasn't tripped. Flipped it off and then back on anyway; no difference.
Where the electrical power enters the furnace itself, there's a toggle switch and a 30-amp screw-in fuse. Flipped the switch off and back on...no difference. Checked the fuse...not blown.
And before anyone else asks, there is no "reset" button that I can find anywhere on the furnace...and, God knows, I've looked for one.
No wires look as if they've overheated.
SO...any of you furnace gurus out there have any ideas where to start? I can't afford to replace the furnace yet again...even though another "better" brand would probably be a wise idea, once I do get some money. I hate to decide that the module is the culprit, when I can't determine that the module is even getting any current to begin with...and a $100+ module that may not fix the problem is out of the budget anyway. No sense in throwing parts at it, unless I know it's going to fix it.
And of course it's a holiday weekend, so anyone who MIGHT come out and look at it for me is going to charge me "out the backside" just for "inconveniencing" them.
Any actually helpful ideas would be greatly appreciated.
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