Hey guys hope all is well, I'm working on 4 carrier systems model 50tfq012, I have looked at all of the systems where the condenser has frozen from the 4 way valve to the compressors, thing is I have changed the defrost boards on them and changed defrost times to 30min periods but I'm still getting bad frosting and the hot gas defrost only seems to be working on one of the 4 units! All wiring etc is the same when compared. The system is using a 417a drop in which will effect it but I don't get why one system out of the 4 is running completely fine whilst other 3 are frosting up! Any suggestion appreciated
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