Troubleshooting Your Mitsubishi Mini Split

One of the leading reasons why Mitsubishi mini splits fail is due to improper installation. Whether you are trying to install a Mitsubishi mini-split for the first time or have been experiencing issues with it, this guide will explore issues that are common with mini splits. Communication Issues with the MITSUBISHI MZ-GL09NA 9,000 BTU 24.6 SEER DUCTLESS MINI-SPLIT HEAT PUMP A mini split communication wire is an important component of any mini split and plays a big role in ensuring that your unit functions properly. Even though there are some models that require that you use an 18-gauge wire, it is mostly recommended that you use a 14-gauge wire. Using a smaller gauge wire than this won’t pass inspection in most cases. The wire should not be solid core but rather should be stranded. This is because solid core wire has been known to result in issues. Also, you should ensure that the wire you end up using is rated for both outdoor and indoor use. If you are installing the mini split for commercial purposes, you will need to use an armored cable. As with all electrical appliance installation, you should consult an electrician to make sure that nothing is a miss. Some of the issues that might result from improper wiring include:

• Poor Signal that might lead to:
  • Outdoor unit might switch on but the indoor unit will not
  • The mini split can operate in some modes but not all
  • Indoor unit turns on but will not run
• Destroyed or damaged compressor or boards
  • Improper wiring can cause other systems to require replacement from complete failure
• The unit gets noisy
• Error codes getting displayed
  • A special code or series of blinking lights get displayed
  • Error codes may be visible on the outdoor or indoor board

Issues with the Refrigerant in the MITSUBISHI MZ-GL15NA 15,000 BTU 21.6 SEER DUCTLESS MINI-SPLIT HEAT PUMP Modern Mitsubishi mini-splits use R-410A, which is a refrigerant that is more environment-friendly than the previously used R-22. Unlike other refrigerants, R-410A operates at much higher pressures which necessitate the use of gauges that can withstand the pressure. Some mini-split units come pre-charged with refrigerant. However, if you need line sets that are longer than usual chances are that you might need to have some more refrigerant added. Each Mitsubishi mini-split manual will come with the amount of refrigerant that is needed for every foot of line set you have. If you end up having too much or too little refrigerant in your line sets, you might experience the following issues:                 Insufficient Refrigerant

• Might not dehumidify properly
• Unit might become noisy
• May not maintain the temperature in the room
• Might only function in one mode and not the other, that is, might work when the unit is in cooling mode but not heating mode

Too Much Refrigerant

• Unit might not turn on
• The system might become noisy
• Unit might not hold the temperature

Each Mitsubishi mini-split specifies the right line set size, which includes the size of the pipes, the maximum and minimum length as well as the maximum height difference between outdoor and indoor unit. You might be tempted to use an old line set not meant for your system. However, you should be aware that this will result in failure. Grounding Issues with MITSUBISHI 20,000 BTU 18 SEER DUAL ZONE HEAT PUMP SYSTEM 6+6 Grounding is necessary for any unit that contains electronics and a Mitsubishi mini-split is no different. The control boards found in a mini-split air conditioner act as small computers that help the unit function efficiently. These boards can get damaged by stray electrical energy, radio frequencies, and power surges. Grounding the unit ensures that the mini-split air conditioner board does not suffer damage from the stray electrical energy. When a Mitsubishi mini-split air conditioner is not grounded properly, one of the issues that might occur is a compressor or board failure. Consult with an electrician to avoid any inconveniences caused by grounding issues. A Leaking Indoor Unit If you find that your mini-split air conditioning unit is leaking, there are areas you can check to determine what is causing the water leak. Your wall mounted Mitsubishi mini-split should have a drain line that is pitched at least 5 degrees down while leaving the indoor unit. Failure to do this can lead to a leak. If your drain line is pitched down properly, the next step in finding the cause of the leak would be to check for clogs in the line. Any obstructions in the drain line can result in a leak. Voltage Issues Most mini-split units need 208/230 volt service. You should always ensure that your Mitsubishi mini-split is connected to the proper voltage. Even then, you might still experience some issues. If your unit receives too low or too high of a voltage, it can result in damaged boards. If your voltage normally fluctuates, you should install a surge protector to ensure that your mini-split is protected from high voltage.