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Boilerman2, many thanks for taking time to reply. I removed the screw from the auto air vent, it was quite waxy, gave it a clean, screwed back in then opened by half a turn. Bled the pump as well. The DHW now seems to work when the hot taps are turned on. Just got to get a replacement low...

A small update Discovered the pressure in the central heating system was zero, probably due to the leaky pressure switch. Pressurised the system, the boiler kicked in and fired up on its own But will not fire up when hot water or central heating are turned on, so still have the same...

I am hoping someone can help with a problem I have with an outdoor Grant Combi Max. The boiler is some 5 years old. The boiler does not fire up when hot water taps are opened or the central heating is turned on. You can hear the pump start but it does not fire. However, the boiler does...