I had the same issue, just resolved it.....apparently the climapro2 rf has a software bug and the override function stopped working when the calendar clicked to 2012....a simple temporary solution is to set your calendar back to 2011 on the climapro, worked a treat for me.
Apparently they're working on a permanent solution, if you ring glowworm's contact centre on 01773 828100 they'll take your details and contact you once a fix is available.
Do you not find the on-off levels too far apart on the climapro 2. Heating On at -half deg and off at +half degree.
And when modulating the heating down to a reduced water temperature, why does the boiler not modulate the power instead of going straight into anti-cycling lockout mode until the return temp has reduced enough??
A good idea the climapro2, but not well implemented.
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