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hi i have a danfoss fp715si programmer which controles hw or ch when i have ch on the motorised valve opens but boiler doesnt fire unless you also hit the hw on. any1 know much about the wiring for these also posted in plumbing section cause i wasnt sure where to put this

hi i have a danfoss fp715si programmer which controles hw or ch when i have ch on the motorised valve opens but boiler doesnt fire unless you also hit the hw on. any1 know much about the wiring for these