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Chronotherm III not working: I set the temp to 70 degree hold, it's 65 now. The system clicks on, displays ''heat on'' but nothing coming out of vents. I switch to off to reset, wait 10 seconds, switch to heat, then adjust to hold at 67 degrees and it will kick on for about 5 minutes then cuts off, to never cut back on again until i reset it again. Any ideas? The instructions manual says contact your HVAC contractor, obvisouly trying to avoid that.

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  • abfergus Dec 15, 2009

    Yes, the furnance is on. Heat is actually produced after "reseting" (clicking to Off/AC then back to heat) but typically only runs through one cycle.

  • abfergus Jan 28, 2010

    No haven't got the solution yet. It's not the thermostat b/c I replaced the thermostat and heat still not staying on. I had HVAC repairman come and he had problems figuring out what was wrong. After over an hour he determined it must be a bad circuit board, and would be $2k to replace. Then he suggested I replace the whole unit for, gulp, $7k.

    That was 3 weeks ago, and am skeptical of the diagnosis. I have done more research and now convinced it is either the thermocouple or in fact the circuit board. I was going to stop by Lowes tonight and see if they had a replacement thermocouple for my Trane Unit (might as well try the cheap alternative...)

    Other things I noticed, the fan will come on no problem, but the heat will come on for one cycle only.

    It's suppose to get down to 8 degrees this weekend so I need a fix.

  • abfergus Feb 01, 2010

    Never messed with thermocouple. Went to Lowes and the assistant told me it wouldn't be the thermocouple if the pilot light is igniting, also they didn't even sell thermocouples......

    Well turns out my furnace now starting work again, at least for now. My furnace seems to work really well when it's below freezing out. Other then that it only runs one cycle. I have a packaged unit - Trane YCC024 that was installed in 1996.

    My temp. solution has been to get 3 electric heaters that are running when it's 40-50 degrees and pray the furnace cuts on when the temperature drops below freezing...

  • Robotinner May 11, 2010

    I just got confirmation back on this via Email. Took a while thank god your not a popscicle by now. Just for grins jump the R and W terminal at the thermostat and see how long it runs. if it is cutting out when these are jumped you may be tripping the high limit on the furnace. Just odd that the unit runs better when its cold. Take temperatures on incoming air little before filter(may need a probe thermometer) and supply air temp about a foot away from plenum then document the difference between them. As far as the price on this equipment seems a little out there, is this including a AC unit too? I am trying to help but need more info to make a proper diagnosis Sunsetmech

  • Robotinner May 11, 2010

    is the furnace turning on(flames?)

  • Chandler Ede
    Chandler Ede May 11, 2010

    Can you give us an idea what make and model your heating system is?

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Hi Abfergus,
I am having the exact same problems. Were you able to figure out what was wrong?
Thanks for any isight you may have.
Coldinidaho

Posted on Jan 28, 2010

  • coldinidaho Feb 01, 2010

    Hi Abfegus,

    Wondering if the thermocouple was the solution. Tinkered around with mine over the weekend, with no solution in sight. I think that I'm going to have to break down and call in a professional. Just wanting to know if you had any luck over the weekend. Thanks for the help.

    Coldinidaho

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