DIY HVAC Tools

EG4 mini split error codes

EG4's hybrid mini splits run on AC and directly on DC from solar panels, and they use their own numeric code table. Several codes (72, 73, 76, 84) concern the power inputs, so check the solar side as well as the AC feed.

Covers: 12K hybrid solar mini split (AC/DC, R32), 12K / 24K hybrid mini split AC/DC R32 (DWA4 / DWB3 / DGA).

Type it exactly as the unit shows it. Not sure which brand? It is printed on the front of the indoor unit.

Most looked-up EG4 codes

03Communication error between indoor and outdoor units76Low voltage protection72High voltage protection73Current input limitation31Indoor air (room) temperature sensor fault (open or short circuit)51Indoor fan motor lost speed58Outdoor fan motor fault95IPM over-current

All EG4 codes

31 codes. Type to filter the list.

CodeMeaningTypeFix
01Indoor unit data error (EEPROM)FaultTechnician
03Communication error between indoor and outdoor unitsFaultDIY checks
04Indoor unit buttons stuckFaultDIY
05Outdoor unit data error (EEPROM)FaultTechnician
06Indoor fan motor faultFaultDIY checks
31Indoor air (room) temperature sensor fault (open or short circuit)FaultDIY checks
32Indoor evaporator temperature sensor fault (open or short circuit)FaultDIY checks
35Outdoor air temperature sensor fault (open or short circuit)FaultDIY checks
36Outdoor condenser temperature sensor fault (open or short circuit)FaultDIY checks
37Air outlet temperature sensor fault (open or short circuit)FaultDIY checks
51Indoor fan motor lost speedFaultDIY checks
55Compressor feedback errorProtectionTechnician
58Outdoor fan motor faultFaultDIY checks
72High voltage protectionProtectionDIY checks
73Current input limitationProtectionDIY
75Compressor high temperature protectionProtectionDIY checks
76Low voltage protectionProtectionDIY checks
79Demagnetization protection (compressor motor)ProtectionTechnician
81PFC over-currentProtectionTechnician
82Total power protectionProtectionDIY checks
83AD (analog) detection abnormalFaultTechnician
84Unstable currentProtectionDIY checks
85Compressor setting data wrongFaultTechnician
86IPM fault signal (edge)ProtectionTechnician
87IPM fault signal (level)ProtectionTechnician
91IPM over-temperatureProtectionDIY checks
92Compressor lack of phaseProtectionTechnician
93Compressor lost speedProtectionTechnician
94IPM over-voltageProtectionTechnician
95IPM over-currentProtectionTechnician
96IPM current shortageProtectionTechnician

How EG4 shows error codes

The indoor unit's LED display shows a two-digit number in place of the temperature. EG4 units also run on DC from solar panels, so several codes concern the DC input and the power stage rather than the refrigerant side. 01 to 06 are indoor and communication faults, 31 to 37 are temperature sensors, 51 to 58 are motors, 72 to 79 are voltage and current protections, and 81 to 96 are inverter and compressor drive faults.

Sources

  • EG4 12K Hybrid Solar Powered Mini-Split R32 User Manual (2025), section 14.3 Indoor Unit LED Error Codes
  • EG4 12K / 24K Hybrid Mini-Split AC/DC R32 User Manual (10/2025)

Updated September 2026. Manufacturer site: eg4electronics.com