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Hope it's fixed by now but when mine did this it was the DHW flow switch - Potterton part no 222131

I have a 13 year old Lynx2 which has given great service and looks set for plenty more. From minor repairs to mine I know that the reset light can be illuminated by the overheat thermostats (one on CH one on HW) or the CH flow switch. The thermostats are only a few pounds and are easily fitted...