ferroli modena 80e says not enough pressure in system, yet pressure reads 1.5. No central heating or hot water for over a week now. plumber came round and concluded it needed new water pressure switch. even ferroli agreed with him. had it fitted but still not working, have tried allsorts, putting more water in, taking some out, checking all the rads etc. yet bar still reads sufficient pressure to operate but system dissagrees. Any ideas? please. . . .

mark kiff, November 2007

firstly there is two wires going to the low water pressure switch link them together and try if it works then the new switch is faulty secondly check for continuity between the two wires at the mf03 pcb as the wire may be broken so no matter what you do it will never work if all these checks are ok then the only thing it can be is a faulty pcb

ricky, November 2007

is the pipe blocked that the low pressure switch connects into? wires on switch round right way?

andy, November 2007