Boiler pressure zero but radiators SUPER HOT!!!!?

[royshepherd]

Hi all

I previously posted the following message and received confirmation that the PRV was at fault. However I have a further question to ask.

We have a Remeha Avanta Plus condensing boiler. We recently moved to the house (3 months ago) and have noticed the pressure gradually drops and requires regular (weekly) topping up to restore the pressure. This has worked fine for the past few months... until now.

When I open the filling loop to top up the system the pressure no longer increases, it sits at 0.6 - 0.7 bar. Simultaneously water flows (not drips) from the small copper pipe on outside of the adjoining wall (I'm not sure what the name of this short pipe is or what it does precisely).

The pressure has continued to drop and now appears to be at zero or very close to. The boiler is still working, in fact it seems to be working too well. As the pressure has dropped the corresponding temperature of the radiators appears to have increased. They're so hot you can't even touch them.

Any ideas? Is she going to BLOW!?

Roy

 

[45yearsagasman]

That copper pipe is the discharge from the PRV which is obviously still passing.That needs to be reppaired/replaced and while the system is depressurised the expansion vessel precharge should be checked.This needs to be done as the boiler is designed to operate pressurised.Stabilise the pressure and then check the operation.