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...