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    Vaillant Boiler 831 thermostat broken - how can I stop it freezing while we are away?

    We have a vaillant 831 and the thermostat is broken so that the heat-call isn't received by the boiler. Nothing happens. I think it probably happened when our 5 year old dropped it a week ago. The thing is we are supposed to go away tomorrow for 10d (for super safe low key Christmas with my...
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