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Old 12-10-2011, 11:45 AM   #1
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Electric furnace / thermostat


I replaced my old thermostat with a programmable one. I was careful to label the wires as I removed them from the old thermostat and install them in the same place on the new one. When I restored power with the new thermostat there was a popping sound at the thermostat and the heat wouldn't come on. Because it was getting cold I decided to just re-install the old one and figure out the new one later. When I re-installed the old one exactly how it had been the heat still wouldn't come on. I was wondering what the problem is likely to be.

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Old 12-10-2011, 12:43 PM   #2
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Electric furnace / thermostat


If you didn't power off the furnace you probably inadvertantly shorted something. You may have blown a fuse, or tripped a mini-breaker on the circuit board. If you have a voltmeter you can check at the thermostat for 24v.

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Old 12-10-2011, 01:19 PM   #3
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there doesn't appear to be any power at the thermostat. how difficult is it to check the fuses/mini-breaker on the circuit board? where are those located at?
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Old 12-10-2011, 01:40 PM   #4
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You will need to open up the sevice panel of the furnace. Do you have a manual...or can you post the model number? I will help you with it.
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Old 12-10-2011, 01:54 PM   #5
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Carrier 40A0018330CD is on the machine in the closet, but it also says air conditioner not furnace.
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Old 12-10-2011, 02:15 PM   #6
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Open up the furnace and find the circuit board. The thermostat wires will be connected to it somewhere. (you know the colors) Check there for voltage. Also check for fuses or a mini-breaker. Note the model number of the board. You will need it if you have to order a replacement.
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Old 12-10-2011, 03:08 PM   #7
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Electric furnace / thermostat


i don't see any fuses or anything i would call a circuit board. here's what's inside:
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Old 12-10-2011, 03:20 PM   #8
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Wow...how old is that furnace? It's possible that you shorted that transformer, or perhaps there is a fuse somewhere in that wirng mess. At any rate, if it's either of those it will be cheape than a circuit board.....you just need to determine which.
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Old 12-10-2011, 03:43 PM   #9
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I'm not sure about the age, I only moved here recently. There are no fuses as far as I can tell. The thing that's on the fan in the picture may be a sort of fuse, but it's not one I'm familiar with. What would a transformer look like? There are only 3 things that aren't immediately visible. One is a coil of wires (in the center of the back panel in the picture), one says therm-a-disc, and one is a brown plastic box with wires running into it.
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Old 12-10-2011, 04:08 PM   #10
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That "thing" right behind the blue wire is a transformer, with the brown paper and metal frame. It lowers the voltage for the control wiring; the thermostat.
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Old 12-10-2011, 04:08 PM   #11
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Electric furnace / thermostat


Check control fuse and wait for warm weather to try again.

You failed as a DIY!

Last edited by bobelectric; 12-10-2011 at 04:12 PM.
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Old 12-10-2011, 04:53 PM   #12
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So what do I do now?

I didn't fail, I have learned several things I didn't know yesterday. Have you learned anything new today?
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Old 12-10-2011, 07:11 PM   #13
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So Jack....is the transformer dead? Have yo udeduced that yet?
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Old 12-10-2011, 07:27 PM   #14
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I'm not sure. I can't really test it because it's not very accessible.
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Old 12-10-2011, 07:32 PM   #15
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Well either you make it accessible or call a HVAC tech to do it for you. Either way it needs to be tested.

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