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Well it's certainly made a difference. I was going to get a new PCB and then look at a pump and heat exchanger or throw in the towel and get a new boiler. I would never have thought of those pipes. Top job thanks.

Thanks, Ianmcd and Gasguru for your help. The flow pipe was almost completely full of black charcoal-like stuff and the return was also very crunchy. I emptied about a mug full of grit out of the two pipes. The rads downstairs are hotter now than they ever have been. I'll put another descaler...

Overnight the boiler ran for 4 minutes at 70-71, this morning it is back to a high of 66 and a low of 55-56. I will check the flexi pipes later on and report back.

OK represurised to 1.5 and now its cycling between 53, 54,55 low and 66 high. So the point it was shutting down is now the point its firing up... It has done this for 4 cycles now, I'm guessing the pump must be good because the water in the heat exchanger drops by 10 degrees in 2 minutes when...

Hi Ian, I've depressurised the boiler with the PRV and the two braided pipes ate rock solid but not crunchy. If I take one off to look inside it, will it be obvious if it's shot and also will I be able to put it back without it leaking if it looks OK? Also would that account for it always...

The control knobs haven't been moved, I've always had them set on max. I can check but that seems unlikely?

Hi Gasguru, I've run the hot tap in the bathroom for 10 minutes and the boiler stays lit. The CH side only reaches 48 degrees while the tap is running. The water out of the tap is 60 degrees. As soon as the tap is turned off the CH side continues to rise to 51 degrees and then goes out...

Good afternoon, I am wondering if anyone can shed any light on what might be wrong with my boiler. Firstly it was in the house when I bought it a little of 12 months ago, I have not installed it / had installed myself. The symptoms are: DHW runs warm, briefly cold then stays hot, I think this...