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Won't shut off when reaching preset temp

The heater will not react to the temperature setting and shut off when the preset temp is reached. It had been working great and suddenly developed this problem.

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  • redzed Nov 06, 2007

    Hi, I have a honeywell oil filled electric heater model# hz-705. The thermostat seems to be shot, I have it set at 20 degrees but it doesn't shut off when it reaches 20 and when it says 20 degrees it's more like 23-24 degrees. Any suggestions? Can the thermostat be reset?

  • mainewoods Nov 06, 2007

    I have the same problem with mine. 90% of the time it just runs and runs until I shut it off. It's a Rinnai RHFE-1004FA propane heater. I have moved the thermostat to the outside of the heater to see if that helps any, but it doesn't seem to. This thing is less than a year old!

  • horseygram Nov 19, 2007

    This happened to mine back in May of this year. Walked into my horse trailer dressing room and temp display was up to 85 (preset was probably around 70). Buttons would not work to shut it off.

  • Greenheart Nov 27, 2007

    I have an older furnace ( Dunham-Bush Inc #GUFD-755) and recently replaced the thermostat. The furnance would not run when in auto mode but would run when in on mode but would not stop even after set tempeture was reached. I had to shut the system down to auto and heat off to get it to stop. It became very hot! The thermostat was only a 4 wire and so the model that I purchased (Hunter Set and Save #44260) I wired according to the codes in manual but the replaced thermostat was very old with a bit different wiring. Old wiring was G-F and was green, R-V was red, y with a c below the y was yellow and w with an h below it was white. I matched the G-F to the G and R-V to the RH, the y with the c below to the Y/O and the w with the h below it to the W/B. Heat will not shut off when fan in in the on position as well as heat and heat will not come on when heat is on and fan is in auto mode. Can anyone help?

  • Greenheart Nov 27, 2007

    I forgot to mention that my furnance is gas.

  • canoe Dec 02, 2007

    Mine won't go to the temp I have set.

  • mho6 Jun 24, 2008

    have replaced the heaters and thermostats but while working initially, now the heaters wont shut off. I've been told this could be a "relay" problem at the electrical panel but dont really know specifically what that might be....

  • janut2000 Dec 01, 2008

    My honeywell thermostat was set at 68 but the furnace doesn't turn off until it reaches 78

  • Anonymous Mar 16, 2014

    If I try to set temperature above 66 degrees it shuts off

  • Anonymous Mar 24, 2014

    boiler makes a howling sound before it reaches the hi temp cut off ?????



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Sounds like a thermostat problem or a short in the wire. Can you give us more info like is it gas or electric and model numbers will help.



Posted on Oct 11, 2007

  • Chandler Ede
    Chandler Ede Oct 29, 2007

    Flyfish, what did you find? Thanks for the por rating, go ahead and ask another question see what you get! Nothing!



Wow, what a GREAT SOLUTION!!!

Posted on Dec 15, 2007

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Most space heaters will heat until the room has reached a temperature 2-3 degrees higher than the temperature you set it for. This is because if it were to only heat to the set temperature, 3 mins later once the room had cooled by a degree, it would be heating again. They're manufactured to heat a bit more so that they don't have to constantly be turning off and on. Don't worry, unless it's still heating after the temperature is 5+ degrees more than you wanted, there's nothing to be worried about.

Posted on Dec 01, 2007

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Posted on Jan 02, 2017

SOURCE: Won't shut off when reaching preset temp

The heater shuts off when it reaches two degrees above the set temperature and turns back on when it is two degrees below.

Posted on Mar 25, 2008

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