36
Appendix
Appendix
Troubleshooting
The table below list the self-diagnostic routines. For some of error codes, you must contact an authorized service centre.
If an error occurs during the operation, it is displayed on the outdoor unit PCB LED, both MAIN PCB and INVERTER PCB.
No. Error Code Meaning Remarks
1 E108 Error due to duplicated communication address Check on repeated indoor unit main address
2 E121
Error on room temperature sensor of indoor unit (Short or Open)
Indoor unit Room Thermistor Open/Short
3 E122 Error on EVA IN sensor of indoor unit (Short or Open) Indoor unit EVA_IN Thermistor Open/Short
4 E123 Error on EVA OUT sensor of indoor unit (Short or Open) Indoor unit EVA_OUT Thermistor Open/Short
5 E153 Error on float switch (2nd detection)
Indoor unit Float Switch Open/Short Drain Pump operation
Check
6 E154 Indoor fan error Check on indoor unit indoor Fan operation
7 E198 Error on thermal fuse of indoor unit (Open) Thermal Fuse Open Check of indoor unit Terminal Block
8 E201
Communication error between the indoor unit and outdoor
unit (Pre-tracking failure or when the actual number of indoor
units are different from the indoor unit quantity setting on the
outdoor unit)
Error due to communication tracking failure after initial power
is supplied (The error occurs regardless of the number of
units.)
Check indoor quantity setting in outdoor
9 E202
Communication error between indoor unit and outdoor unit
(When there is no response from indoor units after tracking is
completed)
Check electrical connection and setting between indoor
unit and outdoor unit
10 E203
Communication error between the outdoor unit and main
micom (For PF #4 to #6 controllers, error will be determined
from the time when the compressor is turned on.)
Check electrical connection and setting between outdoor
unit MAIN PBA - INVERTER PBA
11 E221 Error on outdoor temperature sensor (Short or Open) Check Outdoor sensor Open / Short
12 E231 Error on outdoor COND OUT sensor (Short or Open) Check Cond-Out sensor Open / Short
13 E251
Error on discharge temperature sensor of compressor 1 (Short
or Open)
Check Discharge sensor Open / Short
14 E320 Error on OLP sensor (Short or Open) Check OLP sensor Open / Short
15 E321 Error on ESC IN temperature sensor (Short or Open) Check ESC IN sensor Open / Short
16 E322 Error on ESC OUT temperature sensor (Short or Open) Check ESC OUT sensor Open / Short
17 E403 Compressor down due to freeze protection control Check Outdoor Cond.
18 E404 System stop due to overload protection control Check Comp. when it starts
19 E416 System stop due to discharge temperature -
20 E422
Blockage detected on high pressure pipe during cooling
operation
1. Check if the service valve is open
2. Check for refrigerant leakage (pipe connections, heat
exchanger) and charge refrigerant if necessary
3. Check if there's any blockage on the refrigerant cycle
(indoor unit/outdoor unit)
4. Check if additional refrigerant has been added after pipe
extension
21 E425 Reverse phase or open phase Check whether 3 phase is reversed or opened.
22 E440
Heating operation restricted at outdoor temperature over
Theat_high value (default:30°C)
1. Check the range of temperature limited for heating
operation
2.Check the outdoor temperature sensor
DB68-11274A-00_IM_CAC Universal Outdoor_AA_EN.indd 36DB68-11274A-00_IM_CAC Universal Outdoor_AA_EN.indd 36 2021-09-14 오전 9:22:032021-09-14 오전 9:22:03
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