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  1. G

    Is my Honeywell CMT921 thermostat broken??

    thanks for your helpful response engineerman :) I will speak to my local guy! Cheers!
  2. G

    Is my Honeywell CMT921 thermostat broken??

    Ok I have had some progress (I think) - on the digital screen, it is now showing 'INTERNAL ERROR' with a picture of a spanner flashing. Any ideas??
  3. G

    Is my Honeywell CMT921 thermostat broken??

    actually my last try before I give up and part with £180 for a new one.... is there a reset button on these gadgets?? I can't find on anywhere and not one behind the batteries either... If anyone knows please let me know! Thanks for your help.
  4. G

    Is my Honeywell CMT921 thermostat broken??

    ok...thank you....great, an unexpected £180 down the drain.... Cheers
  5. G

    Is my Honeywell CMT921 thermostat broken??

    its just been on our side table - not near a radiator nor direct heat. So I suppose I just buy a new one and install it. Does anyone know if I'll need to reinstall the relay box?
  6. G

    Is my Honeywell CMT921 thermostat broken??

    Hi All, My honeywell CMT921 has been showing Room Temperature as 38 degrees since the weekend. Its very odd, just suddenly happened on Saturday at some point. I went to check why the heating wasn't on and saw the room temperature showing as 40 degrees! Its definitely not 40 degrees, and...
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