If your Mitsubishi aircon suddenly stops working and shows an error code, don’t panic.
These codes are not random—they are diagnostic signals designed to tell you exactly what’s wrong.
The problem?
Most homeowners in Singapore either:
- Ignore the code
- Google randomly
- Or call technicians without understanding the issue
👉 That leads to overpaying or getting unnecessary repairs
In this guide, you’ll learn:
- The most common Mitsubishi error codes in Singapore
- What each code actually means
- Whether you can fix it yourself or need a technician
🔍 Why Mitsubishi Aircon Shows Error Codes
Mitsubishi aircon systems are built with self-diagnosis technology.
When something fails:
- Sensors detect abnormal behavior
- System triggers an error code
- Prevents further damage
👉 Think of it as your aircon’s warning system
⚠️ Most Common Mitsubishi Aircon Error Codes (Singapore)
🔴 1. E1 Error Code – Indoor/Outdoor Communication Error
Meaning:
The indoor and outdoor units are not communicating properly.
Causes:
- Wiring issues
- PCB board fault
- Power supply problem
What you can do:
- Turn off unit
- Restart after 5 minutes
When to call technician:
If error persists → likely PCB issue
🔴 2. E2 Error Code – Indoor Coil Sensor Fault
Meaning:
Temperature sensor inside indoor unit is malfunctioning.
Impact:
- Incorrect cooling
- System may shut down
Fix:
- Sensor replacement required
🔴 3. E6 Error Code – Fan Motor Problem
Meaning:
Indoor fan is not working properly.
Signs:
- Weak airflow
- No air blowing
Fix:
- Motor repair or replacement
🔴 4. U1 Error Code – Low Refrigerant (Gas Issue)
Meaning:
Your aircon gas level is low.
Important Truth:
Gas doesn’t reduce naturally → there is a leak
Fix:
- Leak AC repair
- Gas refill
👉 Avoid technicians who only “top up gas”
🔴 5. P4 Error Code – Compressor Overheat
Meaning:
Compressor is overheating.
Causes:
- Dirty condenser
- Gas issues
- Overuse
Risk:
Ignoring this can damage compressor permanently
🔴 6. F3 Error Code – Discharge Temperature Issue
Meaning:
Temperature inside compressor too high
Causes:
- Blocked airflow
- Gas imbalance
🔴 7. EA Error Code – Communication Failure
Meaning:
Indoor and outdoor units not synced
Common in:
Older Mitsubishi systems
🔴 8. P8 Error Code – Overcurrent Protection
Meaning:
System drawing too much power
Causes:
- Electrical fault
- Compressor issue
🧠 Quick Reference Table
| Error Code | Problem | Severity |
|---|---|---|
| E1 | Communication error | Medium |
| E2 | Sensor fault | Low |
| E6 | Fan motor issue | Medium |
| U1 | Gas leak | High |
| P4 | Compressor overheating | High |
| F3 | Temperature issue | Medium |
| EA | Communication issue | Medium |
| P8 | Electrical overload | High |
⚠️ Can You Fix Mitsubishi Error Codes Yourself?
You can try:
- Restarting system
- Cleaning filters
- Checking remote settings
DO NOT try:
- Gas refill
- Electrical repair
- Compressor work
👉 These require professional handling
💡 When to Call a Professional Immediately
Call a technician if:
- Error code keeps coming back
- Aircon not cooling
- Strange noises
- Burning smell