My mini split unit operates but will not cool. What can I do to fix this problem?

February 18, 2009 by Shawn Mack  
Filed under Technical Guide

A. Check filters in the indoor unit. If filters are dirty clean or replace.
B. Check to make sure there is no blockage around the indoor or outdoor unit.
C. Check for proper suction pressure.

1. Suction pressure should range between 60 and 70 PSI
2. If pressures are too high, you will have to remove small amounts by evacuating lines until suction pressure is in range.
3. If pressure is too low. You will need to add refrigerant. If the mini split unit “RUN Load Amps” are more than two times the stated “RUN Load Amps” on the label of the outdoor unit label, replace capillary assembly.
4. The mini split unit will also not cool in low outdoor temperatures. There are low ambient kits to help run your air conditioner in temperatures below freezing.

bloglink My mini split unit operates but will not cool.  What can I do to fix this problem? Join the forum discussion on this post - (1) Posts


83 Responses to “My mini split unit operates but will not cool. What can I do to fix this problem?”
  1. ray Says:

    split system has not worked for long time just purchased property. make GREE
    inside fan runs, outside unit tries to kick in spins fan briefly then trips out with a hum not starting comressor at all

  2. taufik amirrudin Says:

    Maybe we can pay much attention to the filter, cause maybe a lot of dust at there.
    Daily cleaning can make our mini split unit live and more cool.
    Thank you

  3. Keith Says:

    I am having same problem as ray…any resolution??????

  4. ryan Says:

    me 3 im having the same problem any resolution?

  5. Dmc Says:

    Hum not coolin? Mine did that a while back, had to replace the compressor. Not cheap.

  6. Dave Says:

    My Sanyo mini split seems to run fine both a/c and heat. Except during the heat setting the indoor unit makes a periodic hissing or wheezing sound. Any suggestions what might be going on?

  7. Rafael Says:

    To Ray and Keith,

    The first suspect is the compressor capacitor. When this capacitor sort of swells, leaks oil, etc. this is a sign of a bad capacitor. I have seen capacitors that look just like new and are bad as well. You can have it tested with a capacitance meter.

    If capacitor is good, then it may be waht Dmc said.

  8. michele DiCola Says:

    we put 5 lbs of freon for $ 500.00 & now is still not working. But green light is flashing & I can hear a hissing soound.
    Should they have tested lines before they even put freon?

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