Question about Honeywell Programmable Thermostat Heater

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The display on my CM921 is only partially showing. The boiler is still coming on and off as programmed. I tried changing batteries, but makes no difference. Is the display panel just dying.

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Posted on Jan 02, 2017

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SOURCE: I have a cm921 thermostat with the correct

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.

Posted on Mar 16, 2010

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SOURCE: i've got a honeywell programmable

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

Posted on Nov 19, 2010

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