Question about Honeywell Programmable Thermostat Heater

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Inaccurate current room temperature reading

I have a Honeywell Chromotherm IV Plus thermostat. The current room temperature displayed is off - too low - by about 6 degrees. Is this adjustable?

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  • Anonymous Feb 08, 2009

    Our programable t stat sometimes overshoots the design temp by 4-5 degrees before shuting down..how do I fix this

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  • 12 Answers

It is not adjustable, sounds like the LED is going bad. Tstat has battery back up for power outages. If you slide the fan switch from auto to on does the blower motor start? If not control problem with unit.

Posted on Jan 22, 2009

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My thermostat is set on 68 degrees and it shows room temperature is 68, but the furnace still kickson, Honeywell said it has a 1 degree difference. so what's the problem then?


Yes there is a one degree tolerance, in fact my heater just kicked on and it is set to 67 and the inside temperature reads 67. It is also a Honeywell.

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Trying to set temp on honeywell t-stat


I believe what your experiencing is the 75 degrees is the hold temp position...the display then reverts back to the actual room temperature...it doesn't mean the set temperature changed back to 65 degrees. Try to reprogram the thermostat schedules, and try not to use the hold function...just the temporary hold. (which is bumping the programmed temperature up or down until the next programmed period)

Dec 09, 2013 | Honeywell Programmable Thermostat Heater

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I have a cm921 thermostat with the correct batteries showing full charge. Yet the battery light is flashing and says battery low. Also displayed room temperature is a lot higher than the actual room...


HONEYWELL WEBSITE:
Go to honeywell.com
Under red welcome sign
Bottom red highlighted box literature/image search
Type in thermostat model number
Click on arrow to right
Then click on the PDF files owners manual / installation instructions
If you can’t find what you want, the bottom left and bottom of web
Page, they have homeowners assistance and Home products to get the help you need.

Feb 28, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

Indoor temp is 5 degrees colder than display reads on digital thermostat


Where are you measuring the indoor temperature?
To compare it to the thermostat temperature you have to measure both temperatures at thermostat.
The thermostat will only control the temperature at the thermostat, not any where else in the room.
The room temperature depending on insulation in walls and ceiling and distance from outside wall and outside temperature, can be as high as 10° difference from outside wall to inside wall of house.
The lower the outside temperature, the greater the room difference in heating. The higher the outside temperature the greater the room difference in cooling.

Feb 13, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

My furnace has stopped working. the thermostat (Honeywell Chromotherm III) displays HOLD - AC. What does this mean? I replaced the batteries but nothing has changed.


Try to find a reset button or just change out the thermostat. I'm guessing you don't have the manual. Thats a pretty old model, I think you have to set the time and day before you can use the thermostat.

Dec 29, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Honeywell TH8320u Vision Pro 8000 Digital keeps calling for heat


Hi,
If the thermostat is not over shooting the temperature than don't worry about it.
These thermostats are very sensitive and will turn the heat back on even before the degrees drop on the display. Often they will shut down before the display changes also. You can change the sensitivity of the thermpstat if you read the directions and change the cycles per hour to a less number. There is an installers program in there that you need to push a combiunation of buttons to get too. The instructions tell you how to do that also.

Hopefully you did not throw away the instruction manual for your t-stat.. :-)

Heatman101

Dec 28, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Housesitting. RTH111B model. I cannot keep the


That is a NONprogramable T-stat. There is no program to overide, therefore there is no need for a "hold" option. To set the temp, place the switch on the side marked

COOL
OFF
HEAT

to the desired setting, and push the up down arrows on the front until the display shows 80.

The DISPLAY will revert back to the current room temperature within a few seconds, and will keep the unit on until it reaches the desired temp.

The set temperature remains at 80, it just shows the current room temp.

Aug 31, 2009 | Heating & Cooling

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