Hi.
I have a Vaillant combi boiler with honeywell controller.
I noticed last few weeks that the water "hammer" has got worse but only recently noticed that even though the timer is off on controller, and even when I set timer from auto to off, the radiators are still hot and heating working. I could not work out why I was getting hammer noise when heating set to off, in the middle of night!!
Any ideas?
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