My daughter and her husband have a Mr Cool mini split in a kid's playroom that just quit cooling. (Outside unit is A-09-HP-C-230B, which seems to be a 9K BTU heat pump) that they report just quit cooling.) They live in Abilene Tx, and like most of Texas, Abilene had its share of 100+ degree days. The outdoor compressor and fan the indoor fan all operate. Neither indoor nor outdoor coils appear dirty. Something REALLY FUNNY to me is that at the outdoor unit the smaller (1/4 inch) copper line is frosted up at the service valve and the larger (3/8 inch) copper line is warm, which seems backwards to me. Shouldn't the larger line, in cooling the line returning from the inside coil coil full of vapor, be the cool line, and the smaller line (full of liquid going to the inside unit) be the warmer line?
Does the frosted smaller line and the warm larger indicate that the reversing line has failed? There are no connections at the reversing valve solenoid to check solenoid continuity or voltage.
Does the frosted smaller line and the warm larger indicate that the reversing line has failed? There are no connections at the reversing valve solenoid to check solenoid continuity or voltage.
source https://hvac-talk.com/vbb/threads/2241270-Mr-Cool-Heat-Pump-quit-cooling-Failed-refersing-valve-Please-help!?goto=newpost
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