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thank you easyflow for your reply, what are your thoughts for the initial problem, what problem would occur when deflating the EV and have recharged it, i am monitoring the pressure in the EV and dropped about 0.2 bar overnight. I have spoken to a engineer, who is coming to have a look, i am...

I am having problems with my vaillant 937 ecotec boiler, approx 7 years old It will not give any hot water or heating and comes up with error code f.75 which says is the pressure sensor switch or pump. I can hear a low rumble noise from the pump also clicking as if to work and have changed the...