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Honeywell CM67ng thermostat not working. Have tried various programmes but still seems to have mind of its own. Can we replace with something else?

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  • gennywalsh Nov 23, 2008

    I have the same problem, the heating is coming on at random times for 10 mins every 20mins and there is no reason for it. The main unit is off and just in case i have set the activation temp to 5degrees......it makes lots of noise when its on which means trips to the loft at 3am

  • Anonymous Nov 23, 2008

    I have the same problem as well. It keeps coming on when it is set not too i.e. 3am!

  • Anonymous Dec 11, 2008

    its a piece of ****!!! throw it out the window

  • fhoh Jan 18, 2009

    Honeywell CM67NG

    Thermostat comes on at random times eg 3am, 6.30am, 5.15am despite being set for 7.30am. and then works perfectly at all other times

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The cm67ng has a feature which attempts to get the temperature to the desired point before the actual time you set. In reality this "feature" just makes the device turn on and off randomly in a really bemusing fashion. You can turn this off with the following:

1, Set timer mode to "OFF"
2, Hold down "Info i" and press "prog 3" and "prog 4" together. Display Should show a spanner in the left hand corner.
3, press "prog 2"
4, repeated press "clock +" till the characters in the display after the colon read "OP" (the number before the colon seems to vary with model).
5, Press the "temp down" button. The 1 in the right hand of the display should become a 0.
6, Press the "info i" button to save your changes.
7, Switch the mode back to auto, the timer should now behave normally.

You should note that a number of other parameters can be changed in this service mode. Some of which could probably do bad things to your central heating system if set incorrectly.. So this is at your own risk! Either way it's best to read the installation manual before attempting to change anything:

http://content.honeywell.com/UK/homes/Technical/CM/cm67i.pdf

Posted on Nov 10, 2009

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I had the same problem. The issue is that if you set the temperature to be 20 degrees at 8.00, it will ensure that the temperature is at 20 degrees at this time. I.e. it will set the boiler going well before this time. I was frequently woken up by the heating being on in the middle of the night. My solution works perfectly for me as I do not have complex requirements. I simply set the timer to be at say 10 degrees at 11.00 pm and again at 8.00 am, and then at 20 degrees at 8.20. This means that between 11.00 om & 8.00am is will maintain 10 degrees, but come 8.01 will be working flat out to try to achieve 20 degrees by 8.20!!
It works for me.

Posted on Sep 02, 2009

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If it comes on at 4am instead of 7am try advancing the on time by 3hrs to 10.00am - this seems to work - until someone comes up with a "proper solution."

Posted on Jan 24, 2009

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