Name: Samsung RF28T5021S9
Brand: Samsung

Question 1

What does error code ABNORMAL_CURRENT mean on Samsung RF28T5021S9?

Accepted Answer

Inverter detected excessive or abnormal current from compressor motor. Cause: Open circuit in compressor wiring at CN04; Bad soldering of current sensor R1; Compressor mechanical load increase or jam; Inverter sense circuit failure.

Question 2

What does error code AMBIENT_SENSOR mean on Samsung RF28T5021S9?

Accepted Answer

Ambient temperature sensor malfunction affects cooling control. Cause: Bad connector contact at CN60 pin 5 and CN90 pin 8; Open circuit in ambient sensor wiring; Short circuit in sensor; Water infiltration or corrosion; Sensor mechanical damage.

Question 3

What does error code AMBIENT-SENSOR mean on Samsung RF28T5021S9?

Accepted Answer

External room temperature sensor is failed or disconnected. Cause: Failed ambient thermistor; Loose CN60 connector; Damaged wiring; Bad solder at R228 (IC01 MICOM pin 12) on Main PCB.

Question 4

What does error code AUTOFILL-OVERFLOW mean on Samsung RF28T5021S9?

Accepted Answer

AutoFill pitcher overflowed or its water sensor failed. Cause: Pitcher overflow — water leaked into the fill area; Failed water level sensor in AutoFill pitcher; Kinked or leaking water supply line to pitcher; Pitcher not seated correctly under fill spout.

Question 5

What does error code C_FAN_ERROR mean on Samsung RF28T5021S9?

Accepted Answer

Condenser cooling fan not operating or speed signal lost. Cause: Fan motor mechanical failure; Bad connector contact at CN40 pin 11; Missing pulse signal from motor rotation; Ice or dust blockage in fan; Wiring disconnection from PCB; MAIN PCB relay or control circuit failure.

Question 6

What does error code C-FAN-ERROR mean on Samsung RF28T5021S9?

Accepted Answer

Condenser fan motor in machine compartment is not spinning. Cause: Failed condenser BLDC fan motor; Foreign object or dust blockage in machine compartment; Broken or disconnected wiring at CN40; Supply voltage absent (7–12V DC on CN40 pin 13 to pin 15); Main PCB driver failure.

Question 7

What does error code COMP-IPM-FAULT mean on Samsung RF28T5021S9?

Accepted Answer

Compressor power module detected an electrical fault. Cause: Open compressor wire (CN04 phases); Damaged or poorly soldered R1/R2 current sensing resistors on inverter PCB; Failed IPM module; Compressor winding fault; Refrigerant system issue.

Question 8

What does error code COMP-IPM-SHUTDOWN mean on Samsung RF28T5021S9?

Accepted Answer

Compressor driver power module shut itself down due to a fault. Cause: DC 15V supply to IPM has dropped below 13.5V; Shorted component on inverter PCB; Overheated IPM module; Compressor or refrigerant cycle fault causing IPM overload.

Question 9

What does error code COMP-LOCATION-DETECT-ERROR mean on Samsung RF28T5021S9?

Accepted Answer

Control board cannot detect compressor motor rotor position. Cause: Open or disconnected compressor wiring at CN04; Failed back-EMF sensing circuit on inverter PCB; Bad solder on Main PCB; Compressor motor failure.

Question 10

What does error code COMP-MOTOR-LOCKED mean on Samsung RF28T5021S9?

Accepted Answer

Compressor is mechanically stuck or running too slowly. Cause: Compressor mechanically seized or locked rotor; Refrigerant system restriction (blocked capillary tube, restricted dryer); Compressor started before pressure equalization (less than 7-minute delay); Sudden input voltage spike or sag; Compressor wiring issue.

RF28T5021S9

Error Codes

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Code	Meaning	Severity
ABNORMAL_CURRENT	Inverter detected excessive or abnormal current from compressor motor	Critical
AMBIENT_SENSOR	Ambient temperature sensor malfunction affects cooling control	Critical
AMBIENT-SENSOR	External room temperature sensor is failed or disconnected	Moderate
AUTOFILL-OVERFLOW	AutoFill pitcher overflowed or its water sensor failed	Moderate
C_FAN_ERROR	Condenser cooling fan not operating or speed signal lost	Critical
C-FAN-ERROR	Condenser fan motor in machine compartment is not spinning	Moderate
COMP-IPM-FAULT	Compressor power module detected an electrical fault	Moderate
COMP-IPM-SHUTDOWN	Compressor driver power module shut itself down due to a fault	Moderate