ive been trying to email you all day but it wont send so well have to do this the hard way first of all to the right hand side of the boiler there is a brass fitting if you look in your manual this is the aqua sensor when you ask the boiler for hot water the green warm start light should start flashing on the front of the boiler if not on the aqua sensor there are three wires there should be 2volts dc across the red and green wires if not you need to isolate the water supply and remove the aqua sensor split the aqua sensor and clean the propellors inside reassemble turn water back on and test if the green light starts to flash now and the boiler works it is advised that you renew the whole sensor if the light still doesnt flash this is usually the circuit board at fault ( these instructions are are all guied at the fact that ther are no problems with the diverter valve so ensure the new diverter valve is installed correctly and is operating the microswitches on it ) email and let me know how you get on
mike
February 2006