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I just had a 2 stage furnace put in and a 1 stage thermostat. The thermostat has been changed three times, but the furnace still won't come on as it's programmed to do. Where do you think the problem lies?

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  • Robert Moller
    Robert Moller May 11, 2010

    Why a single stage thermostat on a two stage unit ?

  • laura Newman May 11, 2010

    Make and Model of the furnace and thermostat?

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A single stage thermostat can be used on a two stage furnace, but there is a dip switch on the furnace computer board that will need to be changed, the directions are in the installers installation guide.
Also not knowing what type and brand of thermostat you have, leaves me guessing, some higher end thermostats have intelligent recovery, if you set it to 70 degrees, at 7 AM, it will try to have the temp to 70 by 7AM, so it could be coming on, even 2 to 3 hours early, depending on the temp. Most of them have a 7 day curve, so it takes awhile for them to adjust, this feature can be turned off, you will again need the installer's install manual.
I hope this has helped, please rate me and also get back to me if you have any more questions.
Sincerely,
Paul Gibson

Posted on May 01, 2010

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In case you don't have it, here's the install guide3 for the water furnace.
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If you DO in fact have wires on the additional W terminals, you more than likely have a heat sequencer that is not energizing the 2nd and possibly the third stage of heat. A three element furnace is typically called a 15kw furnace and the three elements should draw approximately 19 to 20 amps each. So when each stage draws in, the clamp on amprobe on the main incoming wires will correspondingly increase with each stage.

Also, some 15 and 20 kw furnaces require two circuits to supply the elements, and I have been on calls before where the second breaker was not turned on, and in one case, the second circuit wasn't even wired in from the electrical panel box.

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Doesn't sound like you have a heat pump but if you do "o" will also have to be connected which is the reversing valve.

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Hi,
A couple of things... First your furnace should be 2nd stage on a 2 stage thermostat and if the heat pump don't keep up your furnace should be coming on anyway...If you get a Honeywell Vision Pro 8000 series thermostat for 2 stage heat pump operation and an outdoor sensor, you can have the thermostat shut down the heat pump and start the furnace at what ever temperature you decide...

Secondly, you have a problem with the defrost cycle on your heat pump(s) If they are frosting up that bad at 40 degrees than the defrost is not working on them. If they are hookup up right, every fours hours or so they will go into A/C mode and heat the oudoor coil up to melt the ice off of them. The furnace should be heating while that is happening. Sounds like they really don't know what they are doing when it comes to heat pumps...

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Thanks for using Fixya!!

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