While you wait for answers, we may have found some information which could help you.
Click here for Boiler Home Heating Low Water Pressure
Remove boiler cover?
Worcester 30 Cadillac combi boiler won’t fire up and the EA?
Remove cover off gas boiler?
Greenstar 24Ri boiler, fast flashing - can I reset?
Siemens RDJ10RF thermostat problem?
Oil fired boiler thermostat?