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My honeywell cm900 thermostat keeps showing the tempreture as -24 degrees, therefore it keeps working on full power in order to bring the tempreture back up

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I would change the battery first. Then try adjusting the temperature to see if that has any affect. From here I would guess the temp sensing thermistor is open or short, causing it to indicate the extreme temperature of it's capability. Test the thermistor and replace, or replacing the thermostat are the only solutions. I hope this helps.

Posted on Oct 22, 2013

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I have a Honeywell Chronotherm III Thermostat and in instead of showing the temparature in the display it shows -AC. I've replaced the batteries, and tryied adjusting Temp up and down for cooling and...


It would appear to me that you have lost the 24 volt power supply to the thermostat. In referencing the manuals for this thermostat, available @ www.honeywell.com, I've found that when the thermostat is not connected to the wall plate (plate mounted on the wall, that the thermostat either snaps or screws into), it will display the -AC. This being said, either the thermostat is loose on the wall currently, or your 24 volt transformer has died. Hope this helps.

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COOL
OFF
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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.

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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

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I have a Honeywell Programmable Thermostat, T8011R. The users guide for the T8000 series can be found at:
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To keep your temperature at a single setting, just enter the temperature at every period, i.e. WAKE, LEAVE, RETURN AND SLEEP for both the Monday through Friday time frame and the same for the weekend. I do this at 55 degrees when I'm going to be out of town.
To 'Guest' , enter your 68 degrees at WAKE, LEAVE and RETURN, then enter 66 degrees at SLEEP. Do this for the Monday through Friday time frame and again for the Saturday - Sunday time frame.

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