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I have a Saunier Duval Isotwin condens F 35 E with hot water No heating?

the fault on the board says F 14 which is clear on the manual but I have no idea what F 24 means. My setting is on hot water and heating but the heating is not coming on. anyone know what the fault might be?
Robbie, December 2015
maybe contact Saunier Duval and ask?

XXX, December 2015
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