Hi. My Vaillant boiler will only run on high pressure above 2.7bar. Anything below that and the dreaded F75 low pressure warning comes up and I have to put more water in till it gets to 2.8.
The sensor has been changed at least 3 times on this 6 year old boiler. It runs an underfloor heating system and the only metal parts are the boiler itself and 3 circulation pumps. Was power flushed in 2021.
Any thoughts please?
The sensor has been changed at least 3 times on this 6 year old boiler. It runs an underfloor heating system and the only metal parts are the boiler itself and 3 circulation pumps. Was power flushed in 2021.
Any thoughts please?