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What is wrong with my Ideal isar m30100?

What is wrong with my Ideal isar m30100? No heating or hot water.. The red power light is on and the pressure gauge is fine. LED display is not working and completely blank. Please help it's freezing!
Karen Brooks, December 2010
9/10 times when the display is blank and there is power to the boiler, the pcb has failed

Paul the Gasman, December 2010