While you wait for answers, we may have found some information which could help you.
Click here for Heating Thermostat System
One radiator in a bedroom is always cold?
How do i stop the time from flashing on the Siemens RDJ100RF?
Boiler cycle?
Worcester 30 Cadillac combi boiler won’t fire up and the EA?
Vaillant ecotec 831 plus?
Oil fired boiler thermostat?