Question about Honeywell Programmable Thermostat Heater

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HONEYWELL CM921 ROOM THERMOSTAT

I AM TRYING TO SET THE TIMES FOR MY CENTRAL HEATING TO COME ON BUT HOW DO I SET IT SO THAT IT COMES OFF WITHIN A COUPLE OF HOURS, RATHER THAN STAYING ON ALL DAY

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  • dyloconz Dec 15, 2008

    the programme instructions say that the temperature changes can be set between 3.00am and 2.50am - so what happens in that 10 minute period between 2.50 and 3.00am?

  • mark67123 Jan 14, 2009

    Sounds like a similar problem:

    The programmer/timer function on our Honeywell CM921 Wireless Programmable Room Thermostat does not work properly.

    Regardless of the time settings, the heating fails to come on or go off at the correct times set in the programme. For example, if the programme is set to come on at 0630 and go off at 0800, it does not necessarily come on at 0630, it basically comes on whenever it wants. Also, it will not switch off at 0800 and would stay on all day until switched off manually.

    In other words, manually switching on or off is the only way we can control the time the heating operates.
    Any suggestions please?

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Remember the is a time and temperature controller if you want to use as an ON/OFF controller please ensure you OFF times are set to LOW temperatures for example at 8:00am I want the boiler firing to 21°C at 10:00 I want the boiler to go OFF at 5°C so ensure all so called OFF times are set to LOW temperatures.

Posted on Oct 27, 2008

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