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04-04-2009, 10:27 PM #14Could be mis-wired and not openng and closig properly ,or at all.Does it maintain the temp.,and respond when there's a call to heat/cool?
Max air flow is worth a try,given what you have stated. You have only two zones,one is kida small,I'd try max.,not default,to allow more air tothe small zone,so the system doesn't have as much excess air to try and deal with.
Thanks for all your ideas.