Hi I have just had my boiler serviced in November and since , it keeps losing pressure down to 0 everyday, today I refilled and reset and it went over pressure , the radiators just seem to be doing their own thing , no error code is coming up at all and it is not taking instruction from the receiver. I have bled all the rads and put new batteries in the receiver, any ideas as dont trust the plumbers?

sue, February 2015

check the expansion vessel
https://www.youtube.com/watch?v=m1repkd1HHc

Q, February 2015