While you wait for answers, we may have found some information which could help you.
Click here for Boiler Apollo Myson
My son touch v2 padlock issues?
Pressurising a Myson Marathon free standinding boiler 50B?
air in pipes?
has my central heating pump started to seize/jam up?
How do I replace an old boiler with minimum change?
Why red light on ?
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix home heating systems.