Brand: MITSUBISHI ELECTRIC
Category: Air Conditioner
Document Type: Manual
Language: EN
Manual for M series
Uploaded: Nov. 21, 2025, 7:15 p.m.
This manual provides detailed specifications, installation procedures, and troubleshooting information for the M series wall-mounted air conditioning units. It covers various aspects including:
- Model lists for indoor and outdoor units.
- Technical specifications such as cooling/heating capacity, power supply, dimensions, and operating ranges.
- Installation guidelines covering electrical work, refrigerant piping, and drain piping.
- Special functions like low noise mode, demand function, and error monitoring.
- Test run procedures to ensure proper operation after installation.
- Troubleshooting tips for common issues.
The document is organized into sections for easy navigation, with clear diagrams and tables illustrating the information.
Troubleshooting and error codes
| Troubleshooting Item | Possible Cause | Remedy |
|---|---|---|
| Power supply not on | No power supply | Check if the main power switch is ON. |
| No operation | Power supply is OFF. | Turn the power switch ON. |
| Indoor unit does not operate | Power supply is OFF. | Turn the power switch ON. |
| Indoor/outdoor unit communication error | Check wiring connection. Reset the system by turning the power switch OFF and ON again. | |
| Indoor unit does not operate (when outdoor unit is ON) | Indoor unit does not operate. | Check the remote controller setting. Ensure that the indoor unit is not in standby mode. |
| Indoor/outdoor unit communication error | Check wiring connection. Reset the system. | |
| Fan does not operate | Fan motor is faulty. | Contact a qualified technician. |
| Compressor does not operate | Compressor protection is activated. | Wait for 3 minutes after power supply is turned ON. |
| Noise from outdoor unit | Normal operational noise. | This is normal for certain operational conditions. |