Mitsubishi AC Troubleshooting Guide: Quick Fixes for Common Issues

Mitsubishi air conditioners are known for their high-quality build and efficient cooling. However, just like any other home appliance, air conditioners can face problems, and it’s important to know how to troubleshoot them. In this blog post, we will discuss some common issues that you may face with your Mitsubishi air conditioner and provide you with a guide to troubleshooting them.

1. Air Conditioner not Turning On:

If you’ve checked the power supply and everything seems to be working correctly, you can try resetting the unit. To do this, turn off the air conditioner at the thermostat and unplug it from the electrical outlet. Wait for 30 minutes, then plug it back in and turn it on. If this doesn’t work, there could be a problem with the thermostat or the control board.

2. Air Conditioner not Cooling:

If your Mitsubishi air conditioner is not cooling, there could be a few different issues at play. The first thing to check is the air filter. A dirty or clogged filter can impede airflow and reduce cooling performance. Make sure to clean or replace the filter as needed. If the filter is not the issue, it could be a refrigerant leak, a faulty compressor, or a problem with the thermostat or control board. These issues require the expertise of a professional HVAC technician.

3. Air Conditioner not Blowing Air:

If your Mitsubishi air conditioner is not blowing air, there could be a problem with the fan or the motor. Check to see if the fan is spinning freely and that there are no obstructions blocking it. You can also check the motor to see if it’s functioning correctly. If the fan and motor are not the issues, it could be a problem with the control board or the wiring. Again, it’s best to call a professional for assistance.

4. Air Conditioner Making Strange Noises:

If your Mitsubishi air conditioner is making strange noises, such as rattling or grinding, it could be a sign of a problem. The most common issue is a loose or damaged fan blade, which can create a rattling noise. It could also be a problem with the motor, compressor, or bearings. If you hear any unusual noises coming from your air conditioner, it’s best to call a professional for assistance.

5. Air Conditioner Leaking Water:

If your Mitsubishi air conditioner is leaking water, it could be a problem with the condensate drain line. The drain line can become clogged with dirt and debris, causing water to back up and overflow. Check to see if the drain line is clear and free of obstructions. It’s also important to make sure that the unit is level, as an unlevel unit can cause water to pool and leak. If the drain line and level are not the issues, it could be a problem with the evaporator coil or refrigerant leak. These issues require the expertise of a professional HVAC technician.

6. Air Conditioner Producing a Foul Odour:

If your Mitsubishi air conditioner is producing a foul odour, it could be a sign of mould or mildew growth within the unit. This can be caused by high humidity levels or condensation buildup. To address this issue, you can try cleaning the air filter, which can trap moisture and contribute to mould growth. You can also try running the unit on “fan-only” mode for a few hours to dry out any excess moisture. If the odour persists, you may need to have the unit professionally cleaned or serviced to eliminate the mould or mildew.

7. Air Conditioner Not Responding to Remote Control:

If your Mitsubishi air conditioner is not responding to the remote control, there could be an issue with the remote itself, the batteries, or the control board. Start by checking the batteries in the remote and replacing them if needed. If the batteries are not the issue, try resetting the remote and the control board. You can do this by unplugging the unit from the electrical outlet and plugging it back in after a few minutes. If the issue persists, it may be a problem with the control board, and you should contact a professional for assistance.

8. Air Conditioner Freezing Up:

Another common issue that you may experience with your Mitsubishi air conditioner is it freezing up. If you notice ice forming on the coils or pipes, it’s a clear sign that your air conditioner is freezing up. One of the most common reasons for this is a dirty air filter, which restricts airflow and causes the evaporator coil to get too cold. To fix this, you need to turn off the air conditioner and let it thaw out completely before replacing the dirty air filter. It’s also essential to ensure that the evaporator coil is clean and free of dirt and debris, which can cause freezing. If the air filter and evaporator coil are not the issue, then it could be a refrigerant leak or a problem with the thermostat or control board. These issues require the expertise of a professional HVAC technician.

9. Air Conditioner Short Cycling:

If your Mitsubishi air conditioner is short cycling, it means that it’s turning on and off frequently. This can be caused by a variety of issues, such as a dirty air filter, a faulty thermostat, or a problem with the control board. Short cycling can also be caused by an oversized air conditioner, which can cool the room too quickly and cause the thermostat to turn off the unit prematurely. To fix this issue, it’s best to call a professional HVAC technician to diagnose the problem and repair it.

10. Air conditioner emitting unpleasant odours:

If your Mitsubishi air conditioner is emitting unpleasant odours, it can be a sign of a few different issues. One common cause is mould or mildew growth in the unit’s evaporator coil or drain pan. This can happen if the air conditioner is not properly maintained or if it’s located in a humid environment. To fix this issue, you need to turn off the air conditioner, remove the filter and clean the evaporator coil with a coil cleaner. You should also clean the drain pan and drain line to prevent future mould growth.

11. Air conditioner producing weak airflow:

If your Mitsubishi air conditioner produces weak airflow, it can be a sign of a clogged air filter or dirty evaporator coil. These issues restrict the airflow and cause the unit to work harder to cool the room. To fix this, you need to turn off the air conditioner, remove the filter and clean it thoroughly. You should also clean the evaporator coil with a coil cleaner to ensure that it’s free of dirt and debris.

12. Air conditioner not dehumidifying the room:

If your Mitsubishi air conditioner is not dehumidifying the room, it can be a sign of a few different issues. One common cause is an undersized air conditioner, which can struggle to cool and dehumidify the room properly. To fix this issue, you may need to upgrade to a larger air conditioner or use a dehumidifier alongside the air conditioner. Another common cause is a dirty air filter or evaporator coil, which restricts airflow and causes the unit to work harder. To fix this, you need to clean the air filter and evaporator coil thoroughly.

Conclusion

In conclusion, if you’re experiencing issues with your Mitsubishi air conditioner, it’s important to troubleshoot the problem and take appropriate action. In many cases, simple issues like a dirty air filter or a clogged drain line can be easily fixed by the homeowner. However, more complex issues like refrigerant leaks or compressor problems require the expertise of a professional HVAC technician. By following the troubleshooting tips provided in this blog post, you can help ensure that your Mitsubishi air conditioner stays in top working order and provides efficient cooling for years to come.