pressure in combi boiler goes down overnight

teegee, February 2015

loses pressure overnight?
when the heating and hot water are not in use?
when the boiler and system are cold?

doesnt lose pressure during the day?
when the heating and hot water are in use?
when the boiler and system are hot?

you must have a leak ''somewhere''
fixing a leak is straightforward
FINDING the leak is the hard part

Q, February 2015

Probably a small leak in the system; pipework, heat exchanger, pump, radiator, diverter valve.

X, February 2015