Main power supply trip switches look OK,changed 13 amp fuse in switch in combi boiler cupboard,still no neon lights or any signs of power showing on the controls of the combi unit.I need to know if something simple is wrong before calling out electrician. Thankyou

David Herbert, January 2009

Your fuse in the switch fuse spur should be 3amp not 13 amp.Check fuses on the pcb

steve, January 2009