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Mend Viessmann 1000 Fault Showing Panel

F5 fault showing on boiler?

I have a Vitodens 1000 it is 12 months old and is showing a F5 fault on the panel, please could you tell me what this is.

Pammie
October 2010
ViessmannViessmann 1000Heating, Home Heating SystemsFault Showing Panel

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