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  1. #1
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    Trane cvhf phase loss fault

    Have a Trane cvhf that keeps tripping on phase loss when trying to start up. Goes thru pre lube strokes the vanes then brings up phase loss fault. Motor doesn't start the starter type is wye delta. Measured the supply voltage all legs there 480 volt. I think the problem may be with the ct circuit what is the troubleshooting procedure for the ct,s

  2. #2
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    Could be a CT, could be the starter module, could be a burned out motor!
    The key to happiness is lower expectations.

    Don't pick the fly crap out of the pepper.

  3. #3
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    thanks tech rob
    the starter module was replaced

  4. #4
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    Have you checked the motor?
    The key to happiness is lower expectations.

    Don't pick the fly crap out of the pepper.

  5. #5
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    Are you sure the contactors are even pulling in?
    Last edited by Tech Rob; 09-05-2015 at 02:27 PM.
    The key to happiness is lower expectations.

    Don't pick the fly crap out of the pepper.

  6. #6
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    if the motor is not starting when the micro thinks it's supposed to it is going to show phase loss, why isnt the motor starting is the question, not why do I show phase loss.
    If you dont stand behind our troops, please feel free...........to stand in front of them.

  7. #7
    Join Date
    Apr 2011
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    Check the control circuit. CT's will show phase loss if it does not show current when calling like others said. Make sure the contactor is pulling in. Had this problem last week on a RTAC it turned out to be a bad contactor coil

  8. #8
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    Depending on the vintage and size of the starter, it could have those Cutler Hammer Advantage contactors with the DC rectifier boards that are known to burn up, or the soldered on wires on the back get brittle from heat and break off. The contactor could be getting power, but not actually pulling in. The newer Benshaws in the air cooled machines are the same way.
    The key to happiness is lower expectations.

    Don't pick the fly crap out of the pepper.

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