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  1. #1
    Join Date
    Feb 2019
    Posts
    2
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    Mitsubishi Mini Split Heat Pump

    Iím working on a mini split heat pump, MN: SUZ KA18NA, for small apartment. When I call for heating, the gas side I have my gauge on only goes up to 400psi and slowly drops to about 200psi. The fault codes Iím getting are for overheat protection on fin temperature and for PC board overheat protection. Iíve check outside coil and filters as well as recovered and vacuumed the system twice today. Still only getting a 2 degree difference in temperature from supply and return. Called tect support before, recommend replacing the PC board and recovering the system. Done both and having the same issue.

  2. #2
    Join Date
    Aug 2002
    Location
    Southold, NY
    Posts
    19,137
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    Then call Tech Support Back!

  3. #3
    Join Date
    Jul 2011
    Posts
    6
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    Quote Originally Posted by RickySpanish View Post
    Iím working on a mini split heat pump, MN: SUZ KA18NA, for small apartment. When I call for heating, the gas side I have my gauge on only goes up to 400psi and slowly drops to about 200psi. The fault codes Iím getting are for overheat protection on fin temperature and for PC board overheat protection. Iíve check outside coil and filters as well as recovered and vacuumed the system twice today. Still only getting a 2 degree difference in temperature from supply and return. Called tect support before, recommend replacing the PC board and recovering the system. Done both and having the same issue.
    What is the exact error code?

    Sent from my SM-N950U using Tapatalk

  4. #4
    Join Date
    Feb 2019
    Posts
    2
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    Thread Starter
    First code was protection for overheat of fin temperature/PC board over heat. Second I just got was protection for overheat of discharge temperature.

  5. #5
    Join Date
    Jul 2011
    Posts
    6
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    Thermistors all good? Ohm value to temp.

    Sent from my SM-N950U using Tapatalk

  6. #6
    Join Date
    Jul 2011
    Posts
    6
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    What's the actual numerical code you got?

    Sent from my SM-N950U using Tapatalk

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