While you wait for answers, we may have found some information which could help you.
Click here for Boiler Losing Pressure
Remove boiler cover?
Worcester boiler dripping water?
Greenstar 24Ri boiler, fast flashing - can I reset?
Oil fired boiler thermostat?
How do i stop the time from flashing on the Siemens RDJ100RF?
Vaillant ecotec 831 plus?