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Sorry but don't know what MZV is, and not sure that the pump is running. But when I switch it on (by selecting continuous or timed) I briefly hear the sound of water and what sounds like a quiet electric motor starting. It does have the green button but not sure where the solenoid is.

Wow, that was fast thank you. The pilot light is on and the green button is fully out. The system seems to be making all the right (usual) noises on being turned on except for the burners not firing up?

Any help would be much appreciated. I woke up this morning to find our house cold and our hot water no longer being heated. The electrical supply to the boiler seems fine (fuse not blown, timer working), and the pilot light is on, but the boiler isn't firing up, despite the room...