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Hi I probably haven't explained it very well. Our water pressure is fine round the house and the boiler is full of water however the display is not showing the correct water pressure level even though sensor & pcb board have been replaced, valves have been cleaned etc. He is a boiler...

Plumber has replaced water pressure sensor, PCB, cleaned valves etc. Still the water pressure bar is only rising to approx 0.9 when the boiler is full when heating on at 85. If drops below 0.6 error F0 and cuts out. Any one experienced water pressure problems and resolved it. :(