My 8 year old baxi platinum is losing pressure when the central heating is running but holds for months with the domestic water. I have eliminated leaking pipes by closing flow and return valves, I have had a bag on the pressure relief pipe and it collects nothing until i run my central heating, then i get about 1 cup of water and i lose pressure on the boiler.
Can anyone tell me why it is only leaking via the PRV on heating but not on water and what i need to fix this?
Can anyone tell me why it is only leaking via the PRV on heating but not on water and what i need to fix this?