Hello, my current system is a Ferroli F24 Combi boiler, I had to turn the water off at the stop tap, turned the water back on and everything was fine. Two days later noticed the hot water was running cold but the CH was still on fine. Had a plumber come and look at it and he said the flow switch was the problem, all he did was look didn't touch any of the pipes, etc. Next morning i noticed the CH wasn't working, so tried resetting the boiler, no joy. I have since had the flow switch replaced and now have hot water, the boiler tries to boot up for the CH but only for about 15 seconds and then it cuts out and the radiator light starts flashing green. Noticed that even with the CH off that the pressure keeps rising from 1.5 bar to just over 3 bar, if i try putting the CH on it gets to 4 bar but then blows the pressure off itself, then goes back down to 3 bar, the plumber said he wasn't sure what else he could do at the time but said it could be the pressure switch, so he'd get a price for that but heard nothing since. Any ideas? Has anybody has similar problem in the past? Just I don't want to/can't really afford to be replacing part after part on the off chance it has a fault when it could be down to something else, thank you in advance.