I did but that is all that has cost me over the last 8 years, so not too bad. It was not just for this problem, the PCB blew up from some rain being blown into the flume.
I have read elsewhere about the heat exchanger so when my plumber comes back from his holiday I will be in touch again...
I have had an ongoing problem with getting hot water on demand. This thankfully has now been sorted by replacing the fan assembly which seemed to be the problem.
I have now tried to have a bath twice and the water is coming through hot with the burning going then the burner turns off for a...