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Thanks but we have tried it without this panel and still does the same. Also yes the flame does lift from the burner. We can actually trick the DHW. If the CH is on and the flame is on, and then we turn the hot water on full the problem does not occur. I am going to try a new NTC sensor...

I have a 13 month old Potterton Promax HE 33plus. When the hot water is called for the flame ignites then increases. As it increases the fan speeds up then the flame goes out. This all takes 2 - 5 seconds and keeps repeating - water will not get hot. If I turn the tap down and the water temp...