Question about Honeywell Programmable Thermostat Heater

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Programmable thermostat intermittent problems...

Our programmable thermostat works great, most of the time. Sometimes, however, the unit will not shut off once the thermostat reaches the programmed temperature. (i.e. AC is set for 72, unit continues to run past 69 and does not shut off until we "override" the programmed temperature)
The programmable thermostat is a LUX version and is about 2 years old. Our ac and heater are both 6 years old.
Could we just need a new thermostat?

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  • Ned C Cook
    Ned C Cook May 11, 2010

    Does the unit shut off when the programmed temp is reached?

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Some tstats control humidity as well. Temp will over shoot set point in order to reach humidity s

Posted on Jun 24, 2017

  • Thomas Woodburn
    Thomas Woodburn Jun 24, 2017

    Some tstats control humidity as well. Temp will over shoot set point in order to reach humidity s

  • Thomas Woodburn
    Thomas Woodburn Jun 24, 2017

    Humidity set point. This is known as the temperature droop. Read your manual or send model number to be sure this is not what is happening. Good Luck

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Is the heater staying on all the time? Most likely cause of themostat trouble is the sensor. Try to find it and measure its resistance at different temps to verify the trouble.

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Solution #2 as above worked (thank you very much!) to get to the programming mode, but on mine keeping Function #13 on the default setting of "0" maintained the AIR.  Toggling the Temp button to "1" changed the system to conventional on/off at the programmed times.

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SOURCE: Thermostat temperatures not reaching preset Energy Star settings

Well with a boiler system like you have it will cost you more money to heat your house that way than if you leave it like it is. With a boiler system it takes a lot longer to heat an area than with a furnace. The best thing you can do is find a happy medium and leave it there at all times. If you read the paper work on your new thermostats they have a set procedure which tells the thermostat if you have forced air or boiler system. Do you have baseboard or in-floor heat how many zones do you have.

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SOURCE: Honeywell programmable Thermostat won't hold time or program

Most thermostats use a six volt transformer for a power source, similar to a door bell, you can tell if yours does by looking at the wires that are attached to the thermostat.

The wires will be thin with just a single strand if you have these wires then you have a transformer, try and find the transformer (good luck) test it with a voltmeter if it fails the test that's it, if not, call the man. Probably it though.

Posted on Feb 15, 2009

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