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Eberspacher not heating water

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The heating on my boat hasn't worked for a long time and I've happily got by with the log burner. I've recently replaced my eberspacher d5wsc and it works fine for heating the radiators but not the water in the calorifier. I've opened the valve that balances the heated water from the eberspacher but it's only warm at the tap. Is there anything else I can do or am I going to have to replace the calorifier? Any other thoughts gratefully received 


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Sounds like the coil (heat exchanger) for the hot water in the calorifier is just air locked. Should be  bleed screw on the top pipe run at the highest point.

If not crack the top connection open a bit to vent it and do it up again. Hope it doesn't leak.

Edited by Boater Sam
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