Any ideas on what is causing this. Hussman display freezer. (2) 5 door sections on one circuit. hot gas defrost. Fans shut down as soon as defrost starts, delay after defrost. Other case on circuit clear as a bell. all heaters in pan operating in defrost. 20 miniute defrost. 15 min drip. Temp on side outlet of distributor rises quickly to 90 degrees the hovers ther for rest of defrost.