While you wait for answers, we may have found some information which could help you.
Success
Message
Pressurising a Myson Marathon free standinding boiler 50B?
re: Myson Main Masquerade as Fire?
Why red light on ?
Myson velaire oil pump?
How do I replace an old boiler with minimum change?
Boiler coming up but heating and hot water not working?
air in pipes?
Thermostat question?
Myson Touch?
My son touch v2 padlock issues?
coal layout?
has my central heating pump started to seize/jam up?