[Help] High pressure in boiler and leaking from overflow pipe - pinholed coil?

Alex1983

Can you isolate the shower. If it's faulty or not it would still need a way to getting into the heating system which goes back to you coil.

tonyh66

mains cold water could be passing throught the mixer shower into the hot water side of the system, you definitely need to isolate the shower it could solve your problem.

Deisler

Alex1983 wrote: »

Can you isolate the shower. If it's faulty or not it would still need a way to getting into the heating system which goes back to you coil.

I can't get access to what is behind the tiles - Only shower mixer that is at this side of the wall...

Deisler

tonyh66 wrote: »

mains cold water could be passing throught the mixer shower into the hot water side of the system, you definitely need to isolate the shower it could solve your problem.

Hi Tony,

It is my boiler that shows high pressure (in CH). If the cold water passes through the mixer shower into my cylinder, why would my boiler shows excessive pressure?

Or do you mean that the cold water can get into boiler and CH? If so, can you please explain how, so I can trace the problem down? I thought my Boiler/CH and my cylinder are isolated by a coil...

Thanks,
D

Alex1983

Like I said it could be faulty it may not be, if it is it still needs to be getting into the heating system which can only happen on a system boiler at the cyclinder coil or the filling loop.

You seem to be capable of doing a bit of plumbing, take the pressure to zero, disconnect the coil and if you get water come out of the coil from the cyclinder then you've proved your fault.

Deisler

Alex1983 wrote: »

Like I said it could be faulty it may not be, if it is it still needs to be getting into the heating system which can only happen on a system boiler at the cyclinder coil or the filling loop.

You seem to be capable of doing a bit of plumbing, take the pressure to zero, disconnect the coil and if you get water come out of the coil from the cyclinder then you've proved your fault.

I think disconnecting the coil from the cylinder is beyond my ability - don't want to risk. But from all tests I have done, I am now convinced that the cylinder is faulty. Will find a gas engineer in to see what to do next.

Have heard of some bad stories that the existing pipes in the house cannot cope with combi boiler, so not sure if I should go for a combi now.... Will do some homework before making the decision...

Thanks a lot for your help. Really appreciate it.