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vokera excell 80 hot water?

Hi I have a excell 80 hot tap or shower turned on, burner goes to full flame water great for 1 min burner goes off for 7 seconds, back on for 1 min and off again 7 seconds and so on anyone help me here please
KENNY, January 2013
blocked heat exchager or faulty thermistors

kash, January 2013
link Click here to see other fixes for Vokera.