Quote:
Originally Posted by whacker
Hi, original poster here.
Just checking in to say, I've not made any progress since last posting, and winter in Michigan has turned mean!
I've been on some other forums regarding this, and the only suggestions have been to check and make sure the condensate water is draining properly, which if it wasn't would influence the speed of the draft inducer fan, which in turn would influence the operation of the pressure switch. I don't think this is it, but I'm still investigating. I'm still leaning toward changing out the gas valve, but I'd rather not just throw good money after bad.
Hay Zee, I haven't been able to find a way to scan my owner's manual schematic and sequence of operations. If I do you'll be the first to get it.
So in the meantime, I'm relying on a neighbor to come and check the premises daily whenever I have to be gone longer than a day!
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Have them check the coils above the furnace. Ours were filthy and they were slowing down the airflow and causing the furnace to overheat and lock out. This also ended up blowing the pressure switch. We replaced the pressure switch and it still wasn't working, then we opened it up and cleaned those coils, and that did the trick. The furnace even sounds "healthier" now and it's working fine.
Just as another troubleshooting tip, our furnace is bigger than it needs to be according to the tech, and since we have 2 floors (one is a half basement) and the thermostat is upstairs, I keep the upstairs vents closed in the winter to try to equalize the temp differential. He suggested just opening them all up in case that was effecting the furnace by restricting the flow too much. We did that as well. Might want to try these things to see if it works. Good luck!
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