While you wait for answers, we may have found some information which could help you.
Click here for Heating Losing Leaks
Siemens RDJ10RF thermostat problem?
One radiator in a bedroom is always cold?
Oil fired boiler thermostat?
Worcester boiler dripping water?
How to fix my fireplace?
How do i stop the time from flashing on the Siemens RDJ100RF?