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Thanks for the replies. Found a high temperature reset on the wiring diagram, pressed the reset, 'click' - back in business. Would have paid £210+vat for the Vaillant engineer to do the same. How gutted would I have been............?

My combi boiler gas ceased to function. Worked yesterday - dead today. The main burner fails to fire up for either hot water or heating. The C/H circ pump also ain't starting. All the lights are on the switches + the pilot light is ignited. There are 2 x 2A fuses in the panel + these are...