Question about Honeywell Programmable Thermostat Heater

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Cm921 does not seem to switch back on quick enough

The room goes cold before stat switches back on. the flame is on in the back ground

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  • kevhuitt Feb 05, 2009

    thanks for the infor,cant find a dipswitch on back of stat.

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Sounds like you might have to move dipswitch to control cycles per hour found on back of t stat set for system type

Posted on Feb 05, 2009

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Those normally do not fail, they have a mercury switch in them. However there is a cravat they have to be mounted level and up side up. If that is the way it is mounted then just replace it.

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The wifi connection from worcester boiler to room thermastat Honeywell Cm921 , boiler not receiving signal


Can't help you directly, but Honeywell will have user instructions on their website.
It's something like holding the 'stat within a metre of the boiler when the batteries are inserted. Best to RTFI.

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I had my 3 year old mid-efficient furnace serviced a few months ago. I have a 4 room small bungalow. The Honeywell thermostat is set to say 72 and it says it reached 72. However, an independant...


Sounds like the switch that controls the blower is faulty. It should heat up then come on at preset temp. As for the stat where is it located. It should be located 60" off the ground not in any direct sunlight and make sure it is insulated behind the stat. You could have more heat loss in those rooms too. IE poorly insulated windows air penetrating through outlets do those walls face the wind? Is the stat located next to a heat supply?

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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

1 Answer

I've got a honeywell programmable thermostat CM921 and im trying to pair it back up with our boiler. any ideas on how to do it?


used to work on honeywell a few years ago and don't know how different controls are now but you need to find out what connections on controller which are closed contact till desired temp is reached then open contact (a good way to test thermostat is with a heat source like a hair dryer we used these to trick reverse cycle heat pumps into cooling when there was no pump down switch). Then connect the thermostat to your furnace where it is mrked (most furnace's have t/stat marked in thier electrical box) or wire straight into main power feed so that it cuts power to furnace when desired temp is reached they can be wired into heaters various ways and to do the main feed way really needs a qualified sparky but they have trouble sometimes working these things out as they usually only run cables to on/off switch's (which a thermostat basically is) and light fittings and power points i found that qualified refrigeration mech. usually have the know how for these controllers as they work with them all the time so hopefully helped you there, and the t/stat should click in and out even without being hooked into system you can also test these with a beep test on multi meter as temperature goes up and down past set temp the multimeter will beep when contact is made and stop when no contact but check all connections to t/stat as you from memory you can wire it back to front so its on when it shouldn't be and visa versa so it'll pay to write it down what you find as you go for refrence when connecting in

Nov 19, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

Furnace cuts off before reaching set temp.


You can make sure it is not the thermostat by crossing or jumping the R and W terminals (or associated wires) together. This will keep the furnace calling for heat. As it is approaching set temperature, get in front of the furnace and inspect the air filter to make sure it is clean, watch the control module for any error codes that may be turning off the system prematurely.

On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

Mar 07, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

Honeywell thermostat CM921, how to set the heating for a 6.30am??


if you have a programable tstat you need to go through the settings for each day and time. usually the buttton will say prgm or program sometimes it will be set try to get into the settings menue and then you can adjust times

Sep 02, 2009 | Honeywell Programmable Thermostat Heater

2 Answers

With new digital thermostat furnace runs every 10 min.


which type of T-Stat is it ? most standard t-stats have it built in that the temperature range is only a half a degree, it may seem like its running alot more, but in actuality it is maintaining better home comfort as it is not running as long as the old bimetal t-stats which would have a range of anywhere from 2-5 degrees which would cause the furnace to run alot longer, use more energy, use more fuel, and you would notice a definate change in the house temperture before it would come on or shut off, your t-stat seems to be working properly, and it will save you money, remeber also to change those filters !!!

Jan 20, 2009 | Honeywell Programmable Thermostat Heater

3 Answers

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

Nov 11, 2008 | Honeywell Programmable Thermostat Heater

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