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Vokera Linea28 CH fine HW cuts out after ignition?

The CH works fine, but the Domestic Hot Water initially fires up when called for but then cuts out, fires up again and cuts out. The temperature gauge reads erratically.
Neil Bruce, October 2010
Someone suggested the thermistor, I changed that and no difference, any ideas please?

Neil Bruce, October 2010
faulty sensor or blocked heat exchanger

kash, October 2010
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