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Hi Tony, Thanks for the quick reply, I have a white box which says type HSA3 on it, there is a switch that says auto /manual, it is switched to auto at the moment. is this where the problem lies do you think ? regards. Paul

Moved into our house back in July and just switched on the heating to see if it all works ok, all the rads heating up fine, so I left the rads switched on on their individual valve thermostats, and turned the heating off on the boiler control panel (Danfoss FP715), when the boiler came on the...