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Thread: heat pump thermostat...

  1. #1
    DIY Senior Member chris fox's Avatar
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    May 2007
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    Default heat pump thermostat...

    Hi all,

    I am usually over at the shower/tub section but I have an issue with my heatpump/AC system/thermostat. It runs cuts off for about 3 minutes(depending on time of day) and kicks back on. This startup cycle has got to be killing my wallet!

    I had this condenser replaced 1.5 years ago the air handler is original. I have two 3 ton systems for my 1995 track Arizona home. Yes, its hot but the other unit runs longer but stays off longer too.
    Is this a thermostat issue. I read the setup instructions and couldnt find any faults during the setup. I do have the thermostat set on "hold" it is a programmable themostat but my wife is a stay at home mom so no programmable schedule for cost savings.

    Any ideas before I have to make my service call?

    thanks,
    Chris

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    Default

    This is not my area, but could it be the high pressure cutout? Or, a thermal overload? Read the user info for troubleshooting to see what if anything, has a timer on it.

    Often, you can hear the thermostat activating or see the status on the display. Is it turning on and off, or is it continuously calling for the a/c function? If the compressor is operating as the thermostat asks, it may not be the a/c unit.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    DIY Senior Member chris fox's Avatar
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    Default

    A typical scenario is a "click" heard at the thermostat then the air handler and condenser simutanously.

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