Mitsubishi Electric’s CITY MULTI systems utilize error codes to indicate specific issues. These codes typically contain three or four digits, each corresponding to a particular fault. Here are some standard error codes, along with their general descriptions:
403: Communication fault between boards.
1102: Compressor discharge temperature is too high, which may indicate a refrigerant shortage.
2502: Drain fault; high levels of condensate detected, possibly due to blockages or pump failure.
4103: Reverse phase fault; check phase rotation and power supply issues.
6601: Serial transmission abnormalities indicate communication errors within the system.
You can refer to the Mitsubishi Electric Fault Code Checklist for a comprehensive list of error codes and detailed troubleshooting steps.
It’s important to note that while these codes provide insight into system issues, diagnosing and repairing HVAC systems should be performed by qualified professionals to ensure safety and accuracy.
Regular maintenance and prompt attention to error codes can help maintain the efficiency and longevity of your CITY MULTI system.

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