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Which XX end switch terminals are you using on the ZVC406?
What about the other dip switches? is this unit master or slave? I'm assuming you must have another since you have 6 zones and the control only handles 4
Well you haven't given me any indication of a problem except for the flashing LED's which is a new one on me(makes me wonder about a defect in the board). Let me know what your bench test determines.