Question about Honeywell Programmable Thermostat Heater

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Honeywell - cm61ng- Keeps going on and off all night

I have tried to set it, so it comes on and off at certain times of the day but it still goes on and off all through the night. Not sure what to do?

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  • sarah botts Jan 19, 2009

    mine does exactly the same i think its something to do with 12 oclock it does the same in the day, it follows my settings all morning then at 12 oclock it gets a mind of its own

  • neilduckett8 Jan 21, 2009

    My Honeywell cm61ng keeps randomly turning on and off durin 'off' periods

  • Anonymous Jan 22, 2009

    Exactly the same problem except it is turning off when it should but turns itself on at about 4 in the morning and sometime early afternoon. Have tried re-programming on many occasions and am about to give up on it and buy another one.

  • peelplant Jan 22, 2009

    Have exactly same prob. Turns off when its meant to but turns on at 4 in the morning and sometime early afternoon. Have tried reprogramming but to no avail.

  • Anonymous Feb 05, 2009

    Our new honeywell controller also comes on at weird times - does anyone know have to overcome this ?

  • gillbart Feb 10, 2009

    Does anyone know how to turn this off?

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Instructions on how to turn off your optimum start:-

Turn off ‘Optimum Start’
Step 1 Put the thermostat in the OFF position.

Step 2 Press 3 buttons together (at the same time) which are the INFORMATION BUTTON (i) and PROGRAM BUTTONS 3 & 4.
This will show a code of ICL 1 – now let go of the buttons.

Step 3 Press PROGRAM BUTTON 2.
This will now show a code of 30t 1

Step 4 Press the + BUTTON (on the left of the display), tap through until you reach 15 OP 1

Step 5 With the TEMPERATURE DOWN BUTTON; change the 01 to a FLASHING 0. Confirm the FLASHING 0 with the INFORMATION BUTTON ( i ). The 0 will now be static.

Step 6 Put the Thermostat back in the ‘AUTO’ position.
‘OPTIMUM START’ is now switched off.

Posted on Feb 12, 2009

  • mark
    mark Feb 13, 2015

    Inadvertantly put my thermosat in optimum start mode. No clue given in the instruction leaflet as to how to switch this off. Jon Garnett's advice fixed the problem in a couple of minutes. Thanks very much

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Mine does the same and displays a little symbol "OPT". I found the instruction manual online and it says

"Optimum Start means that the CM61NG will switch on your heating system so that your desired comfort temperature is reached at the programmed time, thus avoiding unnecessary boiler
firing"

So it may be that you've set your times for when you want the boiler to start heating up the house, not in fact when you want the house to be at that temperature.

Instructions
content.honeywell.com/UK/homes/Technical/CM60NG/CM61%20user.pdf

I'm trying setting the times a bit later and will report back if it doesn't fix my problems.

Posted on Jan 28, 2009

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This is a programmable room thermostat, with timed on and off temperatures. E.g on at 08:00 to give temperature of 22oC, now when you set it to go off, you also need to put in an off temperature e.g 10:00 at 10oC. If this is too high, and i think they are preset to 15oC, it will come one if it drops below this temperature, regardless of what your times are.

Posted on Mar 03, 2009

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Looking for a wiring diagram for a honeywell cm61ng

Posted on Jul 04, 2010

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