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Appendix
Appendix
Troubleshooting
The table below lists the self-diagnostic routines. For some of error codes, you must contact an authorized distributor, or
Samsung HVAC tech support.
If an error occurs during operation, it is displayed on the outdoor unit PCB LED, both MAIN PCB and INVERTER PCB.
No. Error Code Meaning Remarks
1E201
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
2E202
Communication error between ACU Kit and outdoor unit
(When there is no response from indoor units after tracking is
completed)
Check electrical connection and setting between ACU Kit
and outdoor unit
3E203
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
4 E221 Error on outdoor temperature sensor (Short or Open) Check Outdoor sensor Open / Short
5 E231 Error on outdoor COND OUT sensor (Short or Open) Check Cond-Out sensor Open / Short
6E251
Error on discharge temperature sensor of compressor 1 (Short
or Open)
Check Discharge sensor Open / Short
7 E291 High pressure SENSOR ERROR (OPEN/SHORT)
While in operating COMP only, detect
1. Short Error : less than 0.4v, Error detect
2. Open Error : over 4.2v, Error detect
8 E308 Error on outdoor SUCTION sensor(Short or Open) Check SUCTION sensor Short/Open
9 E320 Error on OLP sensor (Short or Open) Check OLP sensor Open / Short
10 E403 Compressor down due to freeze protection control Check Outdoor Cond.
11 E404 System stop due to overload protection control Check Comp. when it starts
12 E407
COMP down due to High Pressure Sensor Protection
Control 1
Check refrigerant pipe line blockage
Check high pressure sensor
Check refrigerant amount
13 E410
COMP down due to Low Pressure Sensor Protection
Control 1
Check low pressure sensor
Check refrigerant amount(leakage)
Check that the indoor unit inlet and outlet are not
covered by anything
Check that the indoor unit motor is operating
Check that the indoor heat exchanger is not frozen
14 E416 COMP down due to disharge temperature protection control 1
Check refrigerant amount
Check EEV
Check service valve blocked
Check defective discharge temperature sensor
15 E440
Heating operation restricted at outdoor temperature over the
limit
1. Check the range of temperature limited for heating
operation
2.Check the outdoor temperature sensor
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