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Im an electrician, recently wired an s plan central heating system for a ecotec 656 system boiler.The boiler fires up perfectly when ch is selected via the room stat but doesn t fire when hot water is selected even though the two port valve is working fine and the switch wire back to the boiler...

im an electrician, recently wired an s plan central heating system for a vaillant 656 ecotec system boiler. The central heating works fine and the boiler fires up when the room stat calls for heat, however the hot water is not firing up the boiler even though the two port valve is working as it...