Multi zone mini split trouble

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Junie

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I bought a 3 zone mini split. So call professionals installed it. It's been freezing at the handlers. I put on one of the handlers with the others off and one of the ones that off froze even though it was off. I want to believe they hot the wires crossed. They been here 3 times and still doing freezing. What can this be?
 

Fitter30

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Most three evap units need at least two unit on. If lines are freezing on a evap unit off the refrigerant lines could be crossed or the wiring. Both wiring and lines have labeling in the condenser for the corresponding termination. Surprise unit isn't showing a fault. If lines were lengthen charge might have to have refrigerant added weigh in. Its all in the install manual.
 
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