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We have 53 questions about mending 'vaillant gb 242'
Vaillant ecotec 831 plus?
how do I rectify the fault as detailed below?
Vaillant eco plus 531 boiler?
how to fix water pressure its down at bottom of grey part?
Vaillant F22 fault?
Boiler over pressure on the hot-water side?
Vaillant condensing boiler ecoTEC plus?
Vaillant VCW-Sine18 T3WFH Lights but then goes off after 5 Min?
Vaillant 828E - no hot water?