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I have replaced the badly kinked flexible hose and re-set system but boiler still cuts out after a couple of days. Anyone know of a valve or switch that might be faulty? e.g. air flow pressure switch? water diverter valve? Pressure relief valve? :cry:

We have a Worcester Bosch Highflow 400 about 9 years old. It cuts out every other day so needs pressing the restart button after I refill with water from the mains connection. This gets the pressure back up. I think it cuts out when pressure has dropped to about 15psi (1bar) so I refill till...