system leak

My boiler’s pressure has been dropping. My plumber is unsure why. After the boiler was isolated, the system pressure dropped 0.2 over the first couple of hours, but hasn’t dropped now for over 24 hours. The boiler pressure went up from 1.5 to 2.2 over the first 24 hours and has now settled to...

My boiler pressure has been dropping for about 8 weeks. Topping up daily but more recently a couple of times a day. No problem could be found, so plumber has isolated the boiler. The system pressure has decreased and now the boiler pressure is going up. Can this be a thing? The plumber is more...