Question about Honeywell Programmable Thermostat Heater

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Thermostat cm927 target room temp keeps going down after being set this has just started doing this after working fine, changed batteries already?

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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

Accurate Joe
  • 61 Answers

SOURCE: heat pump auxiliary heat does not turn on

Turn up your outside thermostat in the outside unit.
You should have about 3 degrees difference in one stage to the next. So I would change the thermosat with one that has three stages of heat.

Posted on Nov 30, 2008

  • 334 Answers

SOURCE: Honeywell RTH230B a/c problem

if you set the thermostat on 70 and your house won't get ant cooler than 72, there is a problem with your system,not your stat. I'm thinking you are low on refrigerant if it is somewhat working. when the unit is running, if you can get your hand on the larger refrigerant line under the black insulation, it should be cold, about 55 degrees.

Posted on Jun 19, 2009

  • 6 Answers

SOURCE: Honeywell thermostat won't regulate temp properly

Is there a setting on your thermostat that makes the unit stay on for 10, 15, 20, 25 minutes after you reach set temp. You can change this setting by looking at your manual for the thermostat. Not sure if there is one for this thermostat but mine has one. Mine was running 15 min after set temp and making it cool down 2 degrees lower than set temp. Hope this helps.

Posted on Jun 25, 2009

  • 1 Answer

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

honeywell cm921 problem with red light flashing tenp not controling boiler can any one hel

Posted on Dec 15, 2009

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1 Answer

Siemens thermostat rdh10rf


If this is battery operated it could be the batteries at fault.

Apr 17, 2014 | Heating & Cooling

1 Answer

Honeywell CM927 thermostat looses contact: the receiver switches off during the night, for example, so we dont have hot water for showering in the morning. What could the problem be?


1) if the thermostat is mechanical you can adjust, clean, and replace the thermostat.
2) if electronic, you can replace the batteries, and clean contacts. Otherwise you must call some tech professional.
However you can go to honeywell, and download your inst.manual for additional troubleshooting and help. see it
http://yourhome.honeywell.com/home/Applications/FindOwnersManual.aspx
God bless you

Jul 27, 2012 | Heating & Cooling

1 Answer

I have the same problem where my honeywell cm921 room thermostat never turns off the central heating. If I set my off temp really low will this solve the problem, but if its really low does this become the...


It's either because the thermo sensor is faulty or the location is wrong. Try setting the temp one degree above room temp and see if that works, if it does it's a location issue. The thermo should be close to the centre of the house, not near an outlet or the RA vent & not in a breezeway or other heatsink, at approx 1.5m above floor level.

Dec 14, 2010 | Honeywell Programmable Thermostat Heater

2 Answers

Thermostat resets itself to 85 degrees a couple hours after I set it to 74 degrees


To manually operate the thermostat set the system to cool and fan to auto then press the HOLD button one time then release, you will see the hold word on the screen after that up the UP or DOWN arrows is setting the desired temperature.

Jul 22, 2010 | White Rodgers White-Rodgers 1F85RF-275...

1 Answer

I can not change the thermostat setting on the unit. Whenever I try to change it, it reverts back to the previous setting.


The thermostat will display the current tempature in the room. When you press the buttons to change the tempature and you see it change back it is probably going back to the room tempature display but still keeping the temp you set it at. Also make sure the "hold" feature is set or the temp you choose can change at different times during the day due to the programmable features built into the thermostat.

Sep 08, 2009 | Honeywell Heating & Cooling

2 Answers

Honeywell thermostat won't regulate temp properly


check to differential setting in the thermostat and are you saying the temp in the room and the set temp is being read from the thermostat or is there another thermometer in the room your looking at

Jun 25, 2009 | Honeywell Electronic Programmable...

1 Answer

Improper Termperature Readings during AC run


personally i'd just replace the thermostat, but try pulling the front panel off and look on the circuit board and see if there is a jumper for F/C or any other settings. you may try changing its position. you can also remove the batteries for 15 minutes and see if it resets itself. the only other thing it could be is a wiring issue.

May 29, 2009 | Heating & Cooling

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