While you wait for answers, we may have found some information which could help you.
Click here for Pressure Heating Water
How to fix my fireplace?
Oil fired boiler thermostat?
Greenstar 24Ri boiler, fast flashing - can I reset?
Vaillant ecotec 831 plus?
One radiator in a bedroom is always cold?
How do i stop the time from flashing on the Siemens RDJ100RF?