Error codes of air conditioners tell you what’s wrong with the system. It indicates how to fix the problem. Mitsubishi aircon units use digital codes to show the errors. You can find them easily with a few simple steps. Let’s find out how to check Mitsubishi aircon error codes and what to do next after find out the code.
Why Error Codes Matter
Error codes help you fix aircon problems. They tell you if there is an issue with airflow, temperature sensors, or refrigerant levels. You can avoid big repairs if you catch a problem early. Mitsubishi is the most popular aircon in Singapore. Aircons these brands show a few common error codes to give the users information about the problem.
What You’ll Need To Check Mitsubishi Aircon Error Code
Below are the items you will need to check error codes of Mitsubishi aircon:
- Remote control (original Mitsubishi remote)
- Aircon unit powered on
- Paper and pen to note the codes
How to Check Mitsubishi Aircon Error Code with Remote Control
Below are the few simple steps to find out the error code:
- Turn the aircon on. Use the remote as normal.
- Press and hold the “Timer” and “Mode” buttons at the same time.
- Keep them pressed for about 3–5 seconds.
- The display on the indoor unit will show a code.
- Note the code.
This method works on many Mitsubishi models. If it does not work, check your user manual. Some models use a different button combination.
Where to See Mitsubishi Aircon Error Code
The error code appears in two places:
Indoor unit display
Look at the small screen on the aircon. It will show “E” followed by digits. For example, “E1”, “E22”, or “E6607”.
Remote control display
Some models show the code on the remote. It flashes or shows “EC” plus numbers. Watch the display carefully.
Always check both screens. Write down the code quickly. It may disappear when the aircon resets.
How to Reset Error Code on Mitsubishi Aircon
After you read the code, you need to reset the unit so it can work again. Follow these steps:
- Turn off the aircon using the remote.
- Unplug the unit from power. If it is hardwired, switch off the circuit breaker.
- Wait for 30 seconds. This clears the system memory.
- Plug it back in or turn the breaker on.
- Turn the aircon on again with the remote.
- Check the display. The error code should be gone.
If the code returns, the issue is still present. You will need to troubleshoot further or call service.
Mitsubishi Heavy Industries Aircon Error Code
Mitsubishi Heavy Industries (MHI) units have different codes. These often start with “E” followed by two or three digits. Here are common ones:
| Code | Meaning |
| E01 | Indoor sensor problem |
| E13 | Heat exchanger sensor error |
| E23 | Flap/motor issue |
| E66 | Compressor problem |
| E6000+ | Special system codes |
How to Read MHI Codes
- Turn on the unit.
- Press “Check” on the remote (model-dependent).
- Watch the indoor unit display.
- Write down the code.
What to Do Next
- Look in the manual for the code meaning.
- Perform basic checks: airflow, filters, power.
- Reset the unit.
- If it returns, call a technician.
Tips to Avoid Error Codes
Follow these simple tips to avoid error codes on your Mitsubishi aircon:
- Clean filters every month.
- Keep area around indoor unit clear.
- Check drain pan for water or mold.
- Use a surge protector to prevent power spikes.
Mitsubishi Aircon Error Code List
Below are the most common error codes you’ll find in Mitsubishi aircons:
| Error Code | Meaning | Possible Causes |
| E0 | Communication error | Wiring issue, disconnected cable, or faulty PCB |
| E1 | Indoor unit fault | Sensor failure or control board issue |
| E6 | Outdoor unit fault | Outdoor fan issue or compressor trouble |
| E7 | Mode conflict | Two indoor units set to opposite modes |
| E9 | Drain system error | Blocked drain pipe or faulty drain pump |
| EA | Freeze prevention active | Low refrigerant, dirty filter, or airflow issue |
| EC | Refrigerant leakage detected | Gas leak or sensor malfunction |
| ED | Indoor fan error | Fan motor failure or foreign object in fan |
| E09 | Discharge pipe sensor fault | Sensor loose, disconnected, or failed |
| E21 | Indoor coil sensor fault | Faulty sensor or wire break |
| E48 | Outdoor unit coil sensor fault | Temperature sensor error or wire damage |
| E88 | Outdoor unit communication error | Faulty outdoor PCB or wiring error |
| 6607 | Drain pump problem | Full drain pan, clogged pump, or pump sensor issue |
| E2502 | Compressor startup failure | Power supply issue, locked compressor |
| E5102 | High pressure protection | Blocked condenser coil, dirty filters, or overcharge |
When to Call a Technician
Below are the cases when you’ll need to call a technician:
- Error returns after reset
- Water keeps building up
- Unusual noises or smells appear
- Cooling or heating fails
Technicians have tools to test sensors, pumps, and refrigerants. Do not ignore persistent errors.
FAQ
How do I read the code if it disappears fast?
Press “Timer” + “Mode” once. It pauses the display. Or take a video with your phone.
Does the code stay if I unplug only the compressor unit?
No. You must unplug the indoor unit or reset the main power. The code memory is in the indoor PCB.
Can I ignore the code and still use the aircon?
You might, but the unit will not work properly. Ignoring issues can lead to bigger repairs.
What if my model looks different?
Check your manual. It will list the button names and code charts. Manuals are also online on Mitsubishi sites.
Is code 6607 dangerous?
Not harmful. It means water is not draining. It can cause leaks or mold if not fixed.
