Honeywell CM67 Wireless Thermostat behaving odd

[ssjjsd]

Please help, my Honeywell CM67 Wireless Thermostat which has worked for about 5 years without any problems has recently started to turn the boiler on outside of the programmed on/off times, if I switch to AUTO, the boiler fires up even though the off time is 9:30 am and the next on time is 6:00pm???

 

[Tris123]

May sound stupid but have the batteries been changed recently? if they have check the receiver box on a combi should be near the boiler if a heat only probably in the airing cupboard a red light usually indicates a problem with signal and will probably need a rebind.

Also, check when you put it on auto if the green light comes on on the receiver if so check your off temps on your thermostat.

 

[bengasman]

Override by any chance?

 

[dreadnoughtheating]

Has the optimisation option be reactivated? I can supply instructions on how to 'de-activate' if needed.

DH

 

[ssjjsd]

Cheers but a re-bind seems to have solved the problem