Pressure loss from Ravenheat RSF820/20

[mickykelly]

This combi is losing a bar of pressure every couple of hours but no sign of any leaky rads/pipes. Water does leak from a pipe leading down from the expansion tank to the Giannini hydraulic valve, a pint at a time, very suddenly once a week or so when its in regular use. This seems to have stopped since we've been using the CH less. This pipe was twisted by a plumber trying to tighten a leaking joint, but the pressure drop started months after this. The boiler works fine as long as its regularly pressured up.

Could the hydraulic valve be damaged as a result of the twisted pipe? Would this account for the pressure drop? I've got a CORGI plumber coming in to look at it this week, but would welcome any advice. I'm hoping its not going to be new boiler time.

 

[Agile]

The leak must be fixed because continual repressurising causes sludge to form.

This model is getting pretty old now and is due for replacement soon/now.

However they are solidly built boilers and can be renovated and kept working but the question becomes for how long is this cost effective.

It may be leaking from a part INSIDE the combustion chamber. Get the CORGI to check it and bring a new AAV with him. Standard part whilch all competent engineers would bring but....

Tony

 

[mickykelly]

thanks for that. it is around eight years old. maybe time to look at alternatives.