3 ph fan motor

I was checking the roof units for clogged condensor coils and non working
fans (each unit has three fans). I found one fan operating at what seemed
like half speed. It was not making any unusual sounds.
Would an open phase in the motor cause this?
Thanks -S
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Yes, and it will burn up if left that way. HURRY! Just so you know however, the open phase could just be a blown fuse in the circuit somewhere.
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