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Old 01-02-2009, 09:05 AM   #1
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Two Furnace Problems


My Winchester furnace is about 5 years old. Recently, the thermostat stopped kicking the furnace on until you messed with it. Then it would work for an hour or two and stop again. So, I replaced the old dial-type tstat with a brand new digital tstat.

It worked great at first. Then about 2 weeks later it started acting the same way. My grandfather had an extra tstat, just like my new one that he bought for a spare (used lightly, very lightly). It, again, fixed the problem for about 2 days.

While this is going on, at 6am this morning, my blower stops kicking on in auto mode (the furnace is working). My initial thought was, "great! now the blower motor is out!" But, I switched it to manual and it works just fine.

So:

Problem #1: What's going on with my tstats?
Problem #2: Why won't the furnace kick the blower fan on?

Thanks, in advance

**UPDATE**

Just called from work to check on the situation and apparently the blower is working on auto again.

**UPDATE2**

Got a call at work; it isn't working again!

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Last edited by jaysinn; 01-02-2009 at 10:52 AM. Reason: Brand of furnace and update(s).
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Old 01-02-2009, 12:52 PM   #2
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Two Furnace Problems


Sounds like either a stuck relay on the control board, bad power supply or mis-wired.

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Old 01-02-2009, 12:55 PM   #3
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Two Furnace Problems


1. Probably not the theermostat. I wish I had a dollar for every good thermostat that had been replaced. I'd be a millionaire.

2. Blower probably doesn't come on because the furnace doesn't light.
There isn't much info here to go on. Need details on what the furnace is doing, Is it trying to light etc..
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Old 01-02-2009, 01:20 PM   #4
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Two Furnace Problems


Sorry,

That's the problem. Okay, having the two separate problems going on at once is confusing. When the furnace doesn't kick on the thermostat does not click. But when the the thermostat clicks, the furnace does kick on. Its like the thermostat doesn't know its supposed to turn on the furnace. (3 thermostats in a row; previously worked fine for 2+years).

Then, when the furnace does kick on, the blower doesn't kick on, the furnace ignites and runs for a while before it overheats and shuts itself off. Turning the fan to manual on resolves that problem and heats the house, but it is now only working in auto mode for a few cycles before quitting again. It is now working part of the time, but not all the time.
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