My Myson Apollo is constantly firing then going out and firing again etc?

I have just submitted a question on my myson apollo 30 S which may have the same fault yours. I assume your fault occurs on low and high positions on the temperature selector switch. The fan timer could be intermitently failing causing the fan motor to stop/start.The fan pressure switch would see this and it would constantly shut down and restart the boiler. Hope I've been of some help.

ken hogg - email arenal@tiscali.co.uk

ken hogg
October 2006