(Models: 4TVW0007B100NB, 4TVW0009B100NB, 4TVW0012B100NB, 4TVW0018B100NB, 4TVW0020B100NB, 4TVW0024B100NB)
E121 Indoor temperature shorted or open
E122 Evap-in sensor problem
E123 Evap-out sensor problem
E126 Discharge sensor problem
E154 Indoor fan problem
E221 Outdoor temperature sensor problem
E237 Condenser sensor problem
E251 Discharge sensor problem
E101 No communication between indoor and outdoor units for 2 minutes
E102 Communication problem received from the outdoor unit
E202 3-minute tracking problem on the outdoor unit
E201 Communication fault after tracking due to non-matching quantity of installed indoor units
E108 Error due to repeated communication address
E109 Communication address not found
E151 Error due to opened EEV (2nd detection)
E152 Error due to closed EEV (2nd detection)
E128 Loosing in Evap-in sensor
E129 Losing in Evap-out sensor
E198 Thermal switch open
The E241 Condenser mid-sensor is loose
E554 Refrigerant leakage (2nd detection)
E450 Abnormally high temperature on the condenser (2nd detection)
E451 Low-pressure switch (2nd detection)
E416 Abnormally high discharge air temperature on the outdoor unit (2nd detection)
E559 Indoor unit operation stopped due to an unconfirmed error on the outdoor unit
E425 Reverse phase detection problem
E403 Compressor operation stopped due to freeze detection(6th detection)
E301 High-pressure sensor is loose
E306 Low-pressure sensor is loose
E428 Outdoor unit compression ratio problem
E413 Outdoor sump down_1 prevention control
E410 Compressor operation stopped due to low-pressure sensor prevention control
E180 Simultaneous opening of cooling/heating MCU solenoid valve (1sst detection)
E181 Simultaneous opening of cooling/heating MCU solenoid valve (2nd detection)
E153 Float switch (2nd detection)
E162 EEPROM problem
E163 EEPROM option problem
E164 Incompatible indoor unit problem