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thanks to all you lads for your input. finally found the fault. inside the boiler housing are a couple of plug/sockets, similar to those on cars, click in with a catch. one of these was loose, not plugged in securely. don't deal with eaga heat. was on phone to automated " your call will be answered as soon as an advisor is available --- 9.30pm solid to 1.00 am. and that's the emergency breakdown number!!!!