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saunier duval 30e (2001)?

Under demand for DHW the burner keeps starting and stopping. It will start so as to heat the water a lttle, then stop for a few seconds then restart.
majofi, January 2011
could be your not turning tap on enough or the domestic heat exchanger needs cleaning

brian, January 2011
link Click here to see other fixes for Saunier Duval.