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Hi, thanks for your replies, my boiler is 9 years old and I have had it serviced regularly,last service was in august this year. I have turned the unit off and back on,changed the programme setting and still the same, the central heating is working fine it is just when I turn the hot water on...

when I run the hot water tap the water is hot for about a minute then goes cold for approximately the same amount of time before it gets hot again, I ran the hot water and noticed the burner light on my combi boiler comes on then flashes when the water goes cold. My boiler is a ideal evo he...