I have a Combine 80 boiler which works OK with the DHW although the temp is quite high. The problem has just started with the CH, notibly when the boiler kicks in there is a loud trickling, gurgling sound of water which was never there before. The CH will then work but after a period of time the boiler turns off and the high temp reset switch needs to be operated.
Any ideas what it could be, I'd greatly appreciate it.
Any ideas what it could be, I'd greatly appreciate it.