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Have a worcester Bosch 30 cdi. Circulating pump stays on in the evening and would stay on throughout the night if I didn't turn off boiler. had someone round from WB, and wiring is ok. Though he didn't think there was a need for a frost stat given that piping was not that long and far from...

I have a problem with me boiler. It is reasonably new and work fine when hot water and central heating are operated but the problem seems to be when the Frost Stat is operated. when I set this to a temperature above the ambient temperature and set the temp on the pipe stat above that then...