While you wait for answers, we may have found some information which could help you.
Click here for Boiler Central Heating System Failure
How do i stop the time from flashing on the Siemens RDJ100RF?
Siemens RDJ10RF thermostat problem?
How to fix my fireplace?
Remove boiler cover?
Greenstar 24Ri boiler, fast flashing - can I reset?
One radiator in a bedroom is always cold?