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  1. #1
    Join Date
    Jul 2009
    Location
    central florida
    Posts
    18

    blowing fuse after awhile

    Customer has Trane heat pump that keeps blowing 5A fuse after 1-14 days.It only goes in first stage heat.I had them run emergency heat to try to blow fuse but didnt happen.

  2. #2
    Join Date
    Aug 2012
    Posts
    2,753
    Voltage spikes may cause this, or their has to be a short somewhere in the 24volt circuit, you have to chase it down, inspect every wire.
    My name is TooCoolforschool and I am a chronic over charger.

  3. #3
    Join Date
    Jan 2008
    Location
    Texas
    Posts
    2,004
    You could check amp draw also. I recently had one that was exactly like your situation. It wpuld work fine then kick a fuse. Checked tstat wire for continuity to ground and to each other. Got a quick reading a couple of times but went away. I had a good meter and set on a sensitive setting so I just thought it was picking up me touching the leads. Finally changed wire and that fixed it. Pulled some of the old wire and the insulation was brittle and the wire was green and corroded.

  4. #4
    Join Date
    Dec 2012
    Location
    Nashville, TN
    Posts
    48
    Quote Originally Posted by fliks View Post
    You could check amp draw also. I recently had one that was exactly like your situation. It wpuld work fine then kick a fuse. Checked tstat wire for continuity to ground and to each other. Got a quick reading a couple of times but went away. I had a good meter and set on a sensitive setting so I just thought it was picking up me touching the leads. Finally changed wire and that fixed it. Pulled some of the old wire and the insulation was brittle and the wire was green and corroded.
    +1

    A couple of trouble spots to check for control wire breaches are where the control wire goes through the wall with the refrigerant line set and inside the compressor compartment. I can't tell you how many times I have repaired spots in the reversing valve wire or pressure switch wire where it had been resting on one of the copper pipes and time and vibration wore through the insulation creating a short to ground.

    -Brian

  5. #5
    Join Date
    Mar 2001
    Posts
    1,529
    Quote Originally Posted by HighlandThunder View Post
    +1

    A couple of trouble spots to check for control wire breaches are where the control wire goes through the wall with the refrigerant line set and inside the compressor compartment. I can't tell you how many times I have repaired spots in the reversing valve wire or pressure switch wire where it had been resting on one of the copper pipes and time and vibration wore through the insulation creating a short to ground.

    -Brian
    +1
    One way to outthink people is to make them think you think. They'll think you're not really thinking what you're trying to get them to think you think...........

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