How to mend Saunier Duval F12/1

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

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heating?

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Saunier Duval Isofast condens F35E....nothing working?

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I have a saunier duval thelia 23e combi boiler?

i have saunier duval combi?

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