I installed this t-stat in February 2005 and it worked fine through the
heating system with my carrier heat pump. The heat pump says it was
manufactured in 9/86... So it was the original one put into the home. I
tried to get A/C this weekend and no luck. I went to the Honeywell
website for troubleshooting and they suggested that I take out the wire
going to the "C" (which for my wiring is the blue wire). I did that and
it still is only providing fan circulation. Any suggestions would be
It could be anything, probably not the t-stat and definitely not the
Get out your VOM, your Gauge Manifold, your digital thermometer, and
your EPA cert, and I'll walk you through it.
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