While you wait for answers, we may have found some information which could help you.
Click here for Hot Water Boiler
Boiler cycle?
Siemens RDJ10RF thermostat problem?
Greenstar 24Ri boiler, fast flashing - can I reset?
One radiator in a bedroom is always cold?
Worcester boiler dripping water?
How do i stop the time from flashing on the Siemens RDJ100RF?