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Ideal ISAR HE30 - Dead to the world?

I have an Ideal ISAR HE30 which has suddenly died on me. No warning, no funny noises - just ok one day, dead the next. I have checked electrical input is ok. Gas and water supplies are connected.
I have changed the pcb but this makes no difference.
Does any one have any idea where to look next?
Simon, December 2007
had very similar fault turned to be pump capacitor

grahame, December 2007