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Can anything catastrophic happen with switching on a never used immersion heater in an unvented cylinder? Heater and cylinder both about 18 years old but water always heated by boiler (which has failed).

Hi - power has gone on our S plan unvented system - boiler and programmer out. There is power in the distribution board supplied by a 3 amp box so that's not the problem. Boiler and all components powered off this board but I can't see any loose connections and it was working fine yesterday...