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Thanks for that - when the hot tap is on the boiler shows 'D', seems to fire up but no hot water. I'll take a look at the diverter valve.

Perfect Xmas timing! Need help with an Ideal Isar HE35, giving heat but no hot water. No fault codes showing on the display, seems normal- tried switching off and on, shutting off heating etc.- nothing. Pressure is 3.0 on gauge with heating on. DHW thermistor, Diverter valve, Control thermistor...