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so it seems as if there is nothing wired into the boiler’s pump terminals. which I guess is no surprise why it is running all the time. would it damage the boiler if I wired the pump across the valve switched live for the valves? i.e. so that the pump only activates when one or both of the...

I read in various places that some earlier Grundfos UPS2 pumps were causing surges that fried the boiler overrun control circuits. The pump was replaced in 2018 (before I moved here, but after the UFH was added) … could it be that it had already fried the boiler circuit, and then wore itself...

Hi all, I know there’s a million posts on this topic but I can’t find the answer.. I have an Vailant EcoTec plus 438. It’s on an S-plan system (2x valves in airing cupboard next to cylinder) with a new wet UFH system added for the kitchen, seemingly on its own zone/system (separate...