baxi combi boiler

[grahamankate]

my boiler preasure drops when the heating is off

had a plumber out could not find any leaks and changed a valve
but to no joy and £140 lighter.

anyone help please

 

[plumbnuts]

Shut off the power supply to the boiler and isolate all the valves under the boiler overnight. If the pressure drops by the morning, you have identified the leak as comming from your boiler. If not, start looking at the rest of the system.
Good luck
Steve

 

[grahamankate]

Thanks Steve will give it a go