my baxi 105e combi pressure goes straight up to 3 bar pressure ?

when you say the diaphram - for the expansion vessel or the hot water small diaphram?

Richard M
January 2009

it sounds like the expansion vessel has lost its charge and needs recharging,you can do this by using a bicycle pump,the pressure to pump it to will be on the vessel,and manufacturers paperwork,if that fails to remedy the fault,the diapghram could be gone,and new vessel will be required.

cal
January 2009