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Expansion valve

Question asked by russfesco on May 5, 2015
Latest reply on May 5, 2015 by totaltech1

Have a frost top unit that had an expansion valve that continually hunted. Unit is under warranty, manufacturer has had us change the expansion valve . New valve does the exact same thing. Have changed the valve and the drier 2 times each and pulled vacuum to 500 microns each time. Any ideas as to what might be going on?