Failure diagnosis
When error occurs during operation, error mode will appear on the outdoor unit MAIN PCB display and inverter PCB display.
NO
Error
code
Description
Measures to be taken by installer
Measures to be taken by service
technician
1
E121
Indoor room
temperature sensor
1. Re-connect the connector
1. Re-connect the connector
2. Replace the sensor
2
E122
Error on IN temperature
sensor of the indoor
unit heat exchanger
1. Re-connect the connector
1. Re-connect the connector
2. Replace the sensor
3
E123
Error on OUT
temperature sensor of
the indoor unit heat
exchanger
1. Re-connect the connector
1. Re-connect the connector
2. Replace the sensor
4
E154
Error on indoor fan
-
1. Re-connect the connector of indoor fan
2. Replace the motor
3. Replace the PBA
5
E202 or
No
display
Communication error
between outdoor unit
MAIN PCB and indoor
unit MAIN PCB
No display: Abnormal
1. Check the short-circuit and
connection of the communication
cable between indoor and
outdoor unit
2. Check outdoor unit power
3. Check the power and
communication cable for
misconnection
1. Re-connect the communication cable and
check for short-circuit
2. Check the power of outdoor unit
3. Check/Replace the indoor unit PBA
4. Check/Replace the outdoor unit PBA
6
E203
Communication error
between outdoor unit
MAIN PCB and inverter
PCB
-
1. Check for any problem on outdoor unit
motor
2. Replace the outdoor unit PBA
7
E221
Outdoor unit suction
temperature sensor
error
1. Re-connect the connector
1. Re-connect the connector
2. Replace the sensor
8
E231
E246
Outdoor unit
Condenser sensor error
1. Re-connect the connector
1. Re-connect the connector
2. Replace the sensor
9
E251
E261
Discharge temperature
sensor error
1. Re-connect the connector
1. Re-connect the connector
2. Replace the sensor
10
E320
OLP sensor error
1. Re-connect the connector
1. Re-connect the connector
2. Replace the sensor
11
E403
Freezing detected in
indoor unit
(When compressor is
stopped)
1. Check for any blockage on air inlet
of indoor unit
1. Check for any blockage on air inlet of
indoor unit
2. Check for indoor fan operation
12
E404
Outdoor unit overload
protection control
(When compressor
stops)
1. Change the location or direction of
the outdoor unit
1. Re-install the outdoor unit
13
E416
Compressor discharge
temperature protection
control
(When compressor
stops)
1. Check for leakage on connected
part between the product and
pipe, and pipe and extended pipe
2. Change the location or direction of
the outdoor unit
1. Find and block the leaking part and re-
charge the refrigerant
2. Re-install the outdoor unit
ENGLISH-61
04
INST
ALLA
TION