sime 102 boiler fault

[denmarl]

I have a sime 102 de luxe losing water from pressure relief valve, I have changed the valve but as soon as heating is turned on it pressurises & still leaks from the valve any ideas please , british gas £75 just to look

 

[Agile]

That seems very reasonable to me.

I would charge £84 !

But its likely to be a failed Expansion Vessel although it might be possible to repressurise it.

Look in the FAQ on this site for further info.

Tony

 

[denmarl]

Thank Tony would this explain why it pressurises & when turned off goes back down below red marker . if it helps boiler is 16 yr old & i have fitted several parts in the past , the boiler is still working perfect on heat & water & i dont want to scrap it Thanks DEN