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  1. #1
    Join Date
    Jan 2020
    Posts
    1
    Post Likes

    Heating cycle repeats even though actual room temperature is same as set temp

    Hello,

    I was wondering if I can get help on the behavior of my heating furnace.

    Basically my set temp is 75F (but can be any other). Once temperature drops to 74F, the heater turns on and works as suppose to. Once thermostat sees 75F, the heater turns off but then right away turns on again and repeats the heating cycle even though thermostat shows 75F as set point and actual temperature.

    This kind of behavior started recently. Any idea what to check or what could cause heater to start heating cycle again after it just finished heating cycle?

  2. #2
    Join Date
    Aug 2002
    Posts
    2,594
    Post Likes
    It could be normal, most modern day thermostats only show whole numbers but look at the decimal degrees to decide when to turn on or off, along with proprietary algorithms.

  3. #3
    Join Date
    Jan 2012
    Location
    Missouri, USA
    Posts
    1,675
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    Do you have an electric furnace or gas?

  4. #4
    Join Date
    Sep 2007
    Location
    edmonds wa
    Posts
    4,434
    Post Likes
    Cold air coming thru wiring behind stat?
    UA Local 32 retired as of Jan 2020

  5. #5
    Join Date
    Jun 2014
    Location
    Dover, DE
    Posts
    11,853
    Post Likes
    Are you using a Nest thermostat?
    I havent failed. Ive just found 10,000 ways that wont work. - Thomas Edison

    Its not whether you get knocked down, its whether you get up. - Vince Lombardi

    "In this house we obey the laws of thermodynamics" - Homer Simpson

    Local 486 Instructor & Service Technician

  6. #6
    Join Date
    Sep 2007
    Location
    State College, PA
    Posts
    2,985
    Post Likes
    Are you sure the furnace is coming back on and not just the indoor fan?

    I have seen that happen many times.
    Can someone please explain to me -
    Why is there never enough time to do it right the first time, but plenty of time to do it twice?


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