Mitsubishi AC Compressor Not Working: 4 Proven Solutions

Is your Mitsubishi AC compressor not working? This in-depth guide provides clear, easy-to-follow steps for diagnosing and possibly resolving the problem.

Mitsubishi AC Compressor Not Working
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Check Power Supply and Thermostat Settings

The first thing you need to ensure is that your air conditioner is receiving power. Locate your home’s electrical panel, often found in basements, garages, or utility rooms. Ensure that the circuit breaker for the AC unit is in the ‘On’ position. If it’s off or in the middle position, flip it to ‘On’ and try running the AC again.

Next, check the thermostat. Make sure it is set to ‘Cool’ and not ‘Heat’ or ‘Off.’ The temperature setting should be at least 5 degrees lower than the current room temperature for the AC to kick in. Verify that the batteries in the thermostat are not dead. Replace them if needed and make sure to check that the digital display is functioning correctly.


Inspect and Clean Air Filters

A dirty or clogged air filter can severely strain your compressor, leading it to malfunction. You’ll find the air filter located inside the indoor unit or the return air duct. The owner’s manual for your specific Mitsubishi model will have instructions for locating the air filter.

Once you’ve found it, unclip or unscrew the cover, slide out the filter, and examine it. If it’s clogged with dust and debris, you can clean it using a mixture of water and a small amount of dish soap. Rinse thoroughly and let it dry completely before reinstalling. If the filter appears damaged or overly clogged, it’s best to replace it with a new one of the same size and type.


Check Compressor Capacitor

The capacitor is a vital component that helps the compressor start-up. Turn off all power to your AC unit for safety. The capacitor is usually found in the external AC unit and looks like a cylindrical object. It’s often placed close to the compressor and is generally covered by a metal or plastic plate.

Use a multimeter to test the capacitor. Set the multimeter to the ‘Capacitance’ setting, and touch the meter’s probes to the capacitor’s terminals. If the reading is significantly below the capacitor’s rated capacitance, it’s faulty and needs to be replaced. Always replace capacitors with one that has the same specifications.

If you don’t have a multimeter, you can get this AstroAI Multimeter Tester from Amazon.


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Check Electrical Wiring and Connections

Turn off the power supply to the AC unit at the circuit breaker before you begin this step to avoid any risk of electric shock. Remove the access panel where the compressor is located, usually at the back or side of the external unit.

Inspect all the electrical wires and connections leading to the compressor. Check for any frayed wires, loose connectors, or signs of burning. If you find any such signs, this could be the cause of your compressor issues. You will need to repair or replace the damaged wires. If you’re not comfortable doing this yourself, it’s best to consult with a professional technician.


Consult the Manual or Seek Professional Help

If you’ve gone through all these steps and the compressor still isn’t working, consult your Mitsubishi AC’s owner’s manual for model-specific troubleshooting tips. If the manual doesn’t provide a solution or you’re not comfortable performing some of these tasks, it’s time to seek professional help. Certified technicians can perform more advanced diagnostics and repairs.

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