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Thank you No boiler light stays on. The diverter valve motor pin operates only when I turn central heating off and leave hotwater thermostat on and turn on hotwater tap, but the boiler dos not fire up. However, when both water and heating the thermostats are on and I turn hotwater tap on the...

No hot water but heating is fine, I changed diverter valve, dhw flow switch and dhw heat exchanger still no hot water, however the boiler gets very excited when the hot water tap is switched on. Could it be that dhw heat exchanger i put in is for 24s?? I assume they both will fit. Thank you