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Yes I agree. It seems that when the cylinder is up to temp the green light on the controller won't come on. It seems illogical that the only way to run the CH when the tank thermostat is satisfied is to run off hot water.

Good morning and Merry Xmas. I have recently had a new Worcester Bosch Boiler and Honeywell ST9420C controller fitted. It seems as if when the water is up to temperature, the central heating won't run. ??? Yesterday, we had the water and heating on 'Continuous' during the day. In the...