Honeywell Customer Care toll-free at 1-800-468-1502. I read the owner/installation manual and there is no explanation. Try Honeywell direct. Have the model number when you call, located on the back of your t-stat. Hope this helps!
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Honeywell Customer Care toll-free at 1-800-468-1502. I read the owner/installation manual and there is no explanation. Try Honeywell direct. Have the model number when you call, located on the back of your t-stat. Hope this helps!