Those eco motors have a quite high failure rate and are very expensive. My friend had his quit last year and it was a $500 motor from the supply house. A few $ more and you can just replace the whole air handler. They do make for a more efficient unit but when the motor dies and it's a $500 motor all of that energy savings is gone. That's why ac guys that know the systems don't recommend anything over 16 seer. Parts price and high failure rates outweigh any energy savings.
The ones I have looked at usually had blown capacitors which is an easy fix. Use good high temp rated ones not the cheap brand caps many manufacturers use.
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