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The company I work for installs only Trane heat pumps, and lately I am seeing more than my share of defrost problems. In the past (we have been Trane dealer for about six years) we had very little...

I agree!

Unit could be in defrost. Defrost cycle is same as cooling. The vapor line would be cold during defrost, and could even frost. My question would be how long does this last. How often does it do...

The valve is attempting to maintain a constant superheat. With an increase or decrease in load the superheat checked at any given time will be different. But that doesnt change the fact that the...