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Vokera Linear 24?

New thermistor fitted,water is running hot & cold. Burner fires up & runs for about 30 secs, shuts down for about 15 secs then fires up again. Keeps repeating this cycle. Any ideas?
Paul B, February 2007
probably blocked plate heat exchanger

mrgas, February 2007
link Click here to see other fixes for Vokera.