Samsung Electronics
4-11
4-2 Troubleshooting for outdoor unit
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 indoor 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
E403
Compressor down due to freeze protection control
Check Outdoor Cond.
16
E404
System stop due to overload protection control
Check Comp. when it starts
17
E416
System stop due to discharge temperature
-
18
E422
Blockage detected on high pressure pipe
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
19
E425
Reverse phase or open phase
Check whether 3 phase is reversed or opened.
20
E440
Heating operation restricted at outdoor temperature over
Theat_high value
HEATING
21
E441
Cooling operation restricted at outdoor temperature below
Tcool_low value
COOLING
22
E458
Fan speed error
FAN1 ERROR
