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Don’t know the model you have but on the 5kw 673 you need to Check the rubber boots on the heat exchanger. Raw water and coolant flow through the heat exchanger with raw water on the inside and coolant on the outside. There are two hose clamps one, keeping the raw water from mixing with coolant and the other keeping the coolant contained. Need to check them for tightness of the clamps.
Tom
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