Common Mitsubishi Air Conditioner Fault Codes (Canberra & Queanbeyan)
Common Mitsubishi Air Conditioner Fault Codes (Ducted & Split Systems)
If your Mitsubishi air conditioner is displaying a fault code, it’s often the system’s way of telling you something isn’t quite right. Whether you live in Canberra or Queanbeyan, understanding these error codes can help you know when to reset your system, or when it’s time to call a licensed HVAC professional like Air Turners.
Below, we break down the most common fault codes found in Mitsubishi Electric ducted and split system air conditioners. Please note: many of these issues should only be handled by a qualified technician. If in doubt, contact us or call (02) 6294 4443.
🔧 Mitsubishi Wall Split System Fault Codes
These codes typically appear on the indoor unit display or remote control.
Common Wall Split Fault Codes
- P1: Indoor/outdoor communication error
- P5: Indoor temperature sensor error
- P6: Heat exchanger sensor fault
- P8: Discharge temperature sensor fault (compressor overheat)
- E0: EEPROM error (main control board failure)
- E6: Outdoor unit fan motor failure
- U0: Low refrigerant (system may require a recharge or leak repair)
What Should You Do?
- Turn the system off at the isolator switch for 5 minutes
- Restart and monitor if the error reappears
- If the error persists, book a service with Air Turners
🌀 Mitsubishi Ducted System Fault Codes
Ducted systems often require checking the controller or zone board to read specific fault indicators. These codes may be displayed on PAR-21 or wall controllers.
Common Ducted Fault Codes
- EE: Indoor control board fault
- U4: Communication error between indoor and outdoor units
- U7: Loss of communication between indoor units (multi-zone systems)
- P9: Discharge pipe temperature sensor fault
- E9: Outdoor coil temperature sensor issue
- F1: Compressor overcurrent protection
Advanced Tip
On wall controllers like the PAR-21MAA, you can access fault codes by holding the “Check” and “Mode” buttons together for 5 seconds. This will display the error on screen.
📍 Mitsubishi Fault Code Support in Canberra & Queanbeyan
At Air Turners, our licensed technicians are trained to work with all Mitsubishi Electric air conditioning models. We provide expert diagnostics and reliable repairs for homes and businesses across Canberra, Queanbeyan, and surrounding regions.
Most Mitsubishi AC faults involve components like the compressor, PCB, sensors, or refrigerant—these are not safe to repair on your own. Let a professional handle it.
Get Help Today
- 📞 Call us on (02) 6294 4443
- 📩 Submit a service request or upload a photo of your error code via our Contact Page
- 📍 We service all suburbs in Canberra ACT and Queanbeyan NSW
📌 Final Thoughts
Seeing a Mitsubishi air conditioner fault code can be stressful, but it’s your system’s way of helping identify what’s wrong. In many cases, a quick reset will do the trick. But if it doesn’t, the safest and most cost-effective move is to get a professional opinion.
Air Turners has been helping local families stay comfortable year-round with honest advice and expert service. Don’t guess—get in touch today and let us take care of it.