Sludged up boiler heat ex qustion .....

[harryfox121]

ok fair enough. I'm not gas safe registered at the moment so I understand your point there, was just trying to learn a bit about boiler fault finding

 

[shawd]

Thing is Harry, To be good at fault finding takes time, late days, headaches, going down the wrong path, and experiance, nobody is going to tell you any sort of shortcut or you would be as good as them without earning the hassle

 

[harryfox121]

I understand that, I was just trying to learn a bit about fault finding, not saying I wanna know everything someone knows/has learned, etc

 

[Paul Barker]

I know that, but also it could be down to a sludged up system, as newer boilers have smaller heat ex's and they can get blocked.

You are basically talking about the Giannoni. It is very obvious when it has sludged up, sounds like an aeroplane taking off. Fortunately I haven't in practice encountered it very often. It is talked about a lot more than the reality.

the pump: do you mean the pump failing/slowing...

yes both happen. You can get a pump failing gradually causing the same symptom the boiler overheats not because it is scaled up but because the pump is real low powered . It can fool you.