Mitsubishi Inverter Cassette AC Error Code List with Solutions
Mitsubishi Electric is one of the most reliable brands in the air conditioning industry. Their Inverter Cassette ACs are widely used in offices, restaurants, showrooms, and commercial spaces because of their powerful cooling, energy efficiency, and elegant design.
But sometimes, even the best ACs stop working and display error codes. These error codes are part of Mitsubishi’s self-diagnosis system. Instead of shutting down without reason, the AC shows a code like P8, E6, F6, or L5, which indicates the exact problem.
In this blog, we’ll share the complete Mitsubishi Inverter Cassette AC error code list with their meanings and possible solutions.
🔹 Why Do Error Codes Appear?
Mitsubishi cassette ACs show error codes when there is:
- Power supply abnormality
- Communication error between indoor and outdoor unit
- Sensor or PCB failure
- Drain pump issues
- Fan motor or compressor malfunction
- Overheating or overload problems
🔹 Mitsubishi Inverter Cassette AC Error Codes with Solutions
Indoor Unit Error Codes
| Error Code | Meaning | Solution |
|---|---|---|
| P1 | Indoor coil sensor abnormal | Replace coil sensor; check wiring and PCB connection. |
| P2 | Room temperature sensor abnormal | Replace faulty sensor; verify wiring connection. |
| P4 | Drain pump fault | Clean drain pipe; check pump motor; replace if damaged. |
| P8 | Indoor fan motor abnormal | Clean fan blades; lubricate motor; replace motor if burnt. |
| E0 | Indoor PCB failure | Reset AC; if issue continues, replace indoor PCB. |
| E6 | Communication error (indoor & outdoor) | Inspect wiring/terminals; replace damaged cable or PCB. |
| U1 | Power supply abnormal | Check voltage, stabilizer, and wiring connections. |
Outdoor Unit Error Codes
Are you looking for Expert AC Services?
| Error Code | Meaning | Solution |
|---|---|---|
| F1 | Outdoor coil sensor abnormal | Replace faulty coil sensor. |
| F2 | Discharge pipe sensor abnormal | Replace discharge pipe temperature sensor. |
| F3 | Suction pipe sensor abnormal | Replace suction pipe sensor. |
| F5 | Outdoor fan motor abnormal | Clean blades; check capacitor; replace motor if faulty. |
| F6 | Overheating / overload | Clean condenser coil; check refrigerant level; ensure ventilation. |
| E9 | Expansion valve abnormal | Inspect wiring and valve coil; replace valve if necessary. |
| L4 | Inverter module overheating | Improve airflow around unit; replace inverter module if faulty. |
| L5 | Compressor motor fault | Inspect wiring/capacitor; replace compressor if motor is damaged. |
🔹 What To Do When Error Code Appears?
- Turn OFF the AC immediately.
- Note down the error code displayed.
- Check for simple issues like power supply or remote settings.
- Do not try to repair compressor, PCB, or wiring yourself.
- Call a qualified Mitsubishi AC service technician.
Mitsubishi Inverter CassetteAC error code list
✅ Mitsubishi AC Repair Service in Noida
If your Mitsubishi Inverter Cassette AC is showing any of these error codes, don’t worry. At Uniq Air Conditioner System, we provide expert repair and maintenance services for Mitsubishi ACs.
📞 Call us: 7290089500
🌐 Visit: www.uniqrepair.com
Our trained technicians handle all types of Mitsubishi AC errors including PCB faults, compressor repair, gas charging, and fan motor replacement — ensuring your cooling never stops!
Mitsubishi Inverter Cassette AC error code list
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Don’t Let an AC Error Freeze Your Comfort – Fix It Fast with These Must-Have Tools & Accessories! ❄️
🔧 AC Repair Tools & Diagnostic Equipment
1. Digital Multimeter – Useful for checking voltage and diagnosing AC issues.
2. AC Gas Leak Detector – For users suspecting refrigerant issues.
3. Fin Comb / Coil Cleaner Brush – Helps in cleaning AC coils.
🧼 AC Cleaning & Maintenance Products
4. AC Coil Cleaner Spray – Helps users self-service their ACs.
5. Split AC Cleaning Cover Kit – For cleaning indoor AC units without mess.
6. Vacuum Pump for AC – For serious DIYers working on gas refilling or servicing.
🔌 Replacement Parts & Accessories
7. AC Remote (Universal / Voltas-specific) – If the remote is malfunctioning.
8. AC Capacitors – For users who diagnosed faulty capacitors.
9. Thermistors or Temperature Sensors – Common cause for some error codes.
🔒 Surge Protectors & Stabilizers
10. AC Voltage Stabilizer – Helps prevent voltage fluctuation issues.
11. Power Surge Protector – To avoid error codes due to electrical surges.
🧊 Portable Cooling Alternatives
12. Portable Air Coolers – As a stop-gap when AC is not working.
13. Rechargeable Mini USB Fans – Budget cooling while waiting for repair.