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Saunier Duval F30E hot water no heating?

As above, in water/heat mode there is no heating! Hot water works fine. Had heat exchanger replaced earlier this year, but i'm sure the heating has been on since. Heating doesn't even kick in with the 'boost' function. displaying no fault code.

paul
October 2011
Saunier DuvalHeating, Home Heating SystemsHot Water Heating Mode

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