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Complete VRF Error Code Reference
Below is a reference of common VRF error codes across all major brands. For interactive lookup with detailed causes and recommended actions, use the tool above.
Daikin VRV Error Codes
| Code | Meaning | Severity |
|---|---|---|
| U4 | Communication error between outdoor and indoor units | High |
| E7 | Compressor overcurrent / overload | High |
| L3 | High discharge pipe temperature | High |
| L4 | Low pressure abnormality (inverter compressor) | High |
| A3 | Drain level abnormality | Medium |
| A6 | Fan motor lock / abnormality | Medium |
| U0 | Refrigerant shortage (system detection) | High |
| E5 | Inverter compressor overload | High |
Mitsubishi City Multi Error Codes
| Code | Meaning | Severity |
|---|---|---|
| P6 | Freeze/overheat protection (outdoor unit) | High |
| P9 | Outdoor unit communication error | High |
| E6 | Compressor overcurrent | High |
| L3 | Refrigerant charge abnormality | High |
| U1 | High pressure switch tripped | High |
| E4 | Expansion valve driver error | High |
LG Multi V Error Codes
| Code | Meaning | Severity |
|---|---|---|
| CH 05 | Communication error between indoor/outdoor | High |
| CH 21 | Compressor overcurrent | High |
| CH 26 | Outdoor compressor overheating | High |
| CH 27 | Abnormal discharge pipe temperature | High |
Fujitsu Airstage Error Codes
| Code | Meaning | Severity |
|---|---|---|
| E1 | Outdoor unit communication error | High |
| E3 | High pressure trip | High |
| E4 | Low pressure trip | High |
Samsung DVM Error Codes
| Code | Meaning | Severity |
|---|---|---|
| E101 | Communication error (indoor to outdoor) | High |
| E121 | Compressor overcurrent | High |
| E221 | Compressor overheating | High |
For any error code not listed here, call Mountain Mechanical at 833-504-4822.
About This Tool
This tool covers the most common error codes we encounter on Manhattan VRF service calls across five major brands. It is not an exhaustive database of every possible code. If your code is not listed, call Mountain Mechanical at 833-504-4822 and we can advise over the phone.
Error codes are a starting point for diagnosis, not a final answer. The same code can have different root causes depending on the specific system, installation, and operating conditions. A factory-certified technician with manufacturer-specific diagnostic tools will determine the actual cause and proper repair.