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We have 129 questions about mending 'vaillant boiler light'
how do I rectify the fault as detailed below?
Vaillant condensing boiler ecoTEC plus?
Vaillant eco plus 531 boiler?
Vailliant turbo max plus 824e?
Advice?
Vaillant ecotec 831 plus?
Vaillant F22 fault?
Vaillant 828E - no hot water?
Boiler over pressure on the hot-water side?