Hi,
About 2 months ago my combi boiler started losing pressure (to zero) when the central heating was switched off. A plumber came round and replaced the PRV and it was fine for a week or two and is now doing the same.
The pressure remains fine when the boiler is used for hot water only. When used for central heating I have to re-pressurise the system and the pressure rises further to 3.5+bar. It then falls quite quickly to zero when turned off. All the time the pipe outside the house (don't know correct term sorry?!) drips water regularly but not a great quantity. There are no visible leaks with the radiators.
I have 2 questions, 1) Is it likely the expansion vessel needs replacing and if so what sort of ballpark figure would this cost (with labour?) and 2) how urgent is it that this be fixed and will it do further damage to the boiler if i leave it a while (money is a bit tight after xmas)
Any help would be appreciated.
Thanks.
About 2 months ago my combi boiler started losing pressure (to zero) when the central heating was switched off. A plumber came round and replaced the PRV and it was fine for a week or two and is now doing the same.
The pressure remains fine when the boiler is used for hot water only. When used for central heating I have to re-pressurise the system and the pressure rises further to 3.5+bar. It then falls quite quickly to zero when turned off. All the time the pipe outside the house (don't know correct term sorry?!) drips water regularly but not a great quantity. There are no visible leaks with the radiators.
I have 2 questions, 1) Is it likely the expansion vessel needs replacing and if so what sort of ballpark figure would this cost (with labour?) and 2) how urgent is it that this be fixed and will it do further damage to the boiler if i leave it a while (money is a bit tight after xmas)
Any help would be appreciated.
Thanks.