Question about Honeywell Programmable Thermostat Heater

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Thermostat shows wrong temperature

I have a Honeywell TH110 DP programmable thermostat (controls a baseboard heater). During heating (set point at 67F) the temperature reading gets stuck on 62F regardless of the actual temperature of the room and the thermostat just keeps the heater on.

I have checked this with a reliable indoor thermometer. For example, it could be 72F inside temp and the thermostat still shows 62F with the baseboard heater going on. I have verified that there are no drafts near the thermostat.

To further verify I have turned the heater power off and let the room cool down to 50F and re-started the heating. For a while the indoor thermometer and the Honeywell unit show the same temperature until it gets to 62F from then on the Honeywell is stuck and the heater keeps working and the room gets warmer beyond the set point of 67F.

Any ideas on what could be causing this?

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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Destinova
  • 46 Answers

SOURCE: problem with Honeywell RTH230B Thermostat

Sounds like you have it wired wrong..   Pop the top off and give me to color of the wires and tell me which letter each color wire is on.. that will tell us right away if you have it wired wrong

Posted on May 27, 2008

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hotuna
  • 288 Answers

SOURCE: thermostat does not stop heat pump unit

Most of these problems are the program settings on these way overcomplicated thermostats. You will need to re-read the instructions on setting the programs. Or bite the bullet and buy a cheaper and simpler one. If you installed it yourself, make sure the settings on the inside are correct, like gas/electric heat, and 24 volts, stuff like that.

Posted on Mar 14, 2008

  • 3 Answers

SOURCE: Honeywell CM921 Showing room temp at -24 degrees, How do I reset?

Heya this is a manufacturing fault from honeywell them selves when it comes up -24 basically it needs to be replaced there is no way around in if you get in touch with honeywell they are generally good about it also if you provide them with the date code and model code they will be greatfull as it seems they have sent out a "bad batch". you locate this by:

A) Move the slide in to the off position
B) Press and hold i for 5 seconds
C) Unit will enter settings mode
D) Press and hold the i button and the + and ¿ button together
E) The unit will hold the relay on for 5 minutes and you can view by pressing the down arrow twice for model id/date code (ww/yy)

I hope this helps

Posted on Feb 12, 2009

SOURCE: Honeywell Thermostat RTH7400D

The thermostat will not cut off the A/C until the thermometer reading gets to 76.

If there is not a heat source near/behind the thermostat which is causing the thermometer to read higher than actual room temperature, it sounds like the thermostat thermometer is out of calibration.

There are ways to calibrate it, but much to involved to go into here.

One solution is to just set the thermostat at 80, knowing that it's really set on 76.

Another solution is to replace the thermostat.

Charlie

Posted on Aug 14, 2009

heatman101
  • 43501 Answers

SOURCE: Incorrect ambient temperature on Honeywell Model RTH221B

Check in your manual for the thermostat. By pushing a combination of buttons you can get into the advanced installer menu. From there you can make an adjustment to correct the temperature.

Posted on Nov 12, 2009

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