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To continue, I didn't replace the PCB. All I did was tighten black box thingy on top of it. I also replaced one of the sensors (Thermister) firsty the ch one with a new one, no difference, so then the DHW one with that same new one. Still no difference. As there is a sensor for DHW and...

Of course not although I thought that could be surmised from the way I had written it. For each look at the pcb all power was off, but at each stage i would reapply power and test. So when the pcb was in the horizontal position with power off I wriggled the socket smaller circuit boards to...

Hi, I have had a similar if not the same problem. There are noises like air coming out and my plumber stated it would be the sensors but as the heating / hot water was not available that would mean both sensors going at the same time, highly improbable. I replaced one of them and it made no...