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ERROR CODES
TROUBLESHOOTING GUIDE
The error codes displayed on the unit display board the location of the breakdown or abnormality.
UNIT
APPEARANCE, PORTION, PARTS SEEMED WRONG METHOD OF CHECK TROUBLESHOOTING
ERROR
CODES
− do not work at all
POWER SUPPLY check the power supply. conrm the power supply.
FUSE CF1 check the electric continuity by tester. [see g.1] PCB(CONTROLLER) should be replaced.
FUSE CF3 check the electric continuity by tester. [see g.1] PCB(CONTROLLER) should be replaced.
PCB(CONTROLLER) other than described above. PCB(CONTROLLER) should be replaced.
A0 DC voltage Error
FAN MOTOR operate without lead wire for FAN MOTOR.
if the same error code appears again, PCB (CONTROLLER) or
PUMP should be replaced.
if other error codes appear, FAN MOTOR should be replaced.
PUMP operate without lead wire for PUMP.
if the same error code appears again, PCB (CONTROLLER) or FAN
MOTOR should be replaced.
if other error codes appear, PUMP should be replaced.
REACTOR
check lead wires are connected to the connector of
REACTOR properly.
if the lead wires are not connected, connect them to the con-
nector properly.
check the electric continuity between connector of
REACTOR by tester.
if there is no electric continuity for REACTOR, it should be re-
placed.
POWER SUPPLY check the power supply. conrm the power supply.
A1 Discharge temperature Error
SENSOR, TEMP. DISCHARGE check the resistance by tester. [see table 4] SENSOR, TEMP. DEFROST should be replaced.
GAS LEAKAGE check the service valve and refrigerant circuit (pipe). collect refrigerant once, then recharge with prescribed mass.
A2
protective action against
excess
current DC current detection
UNREASONABLE OPERATION UNDER
OVERLOAD
check the place of installation (blockage of air inlet &
outlet ).
check the excess gas.
ensure the installation position to avoid blockage of air inlet &
outlet.
if excess gas is observed, collect all refrigerant once, then re-
charge with prescribed mass.
DROP OF POWER VOLTAGE check the power voltage (230V) during operation. conrm the power supply voltage. (230V)
MOMENTARY STOP OF POWER(IN CASE
OF LIGHTNING)
restart operation.
PCB(CONTROLLER)
operate without the junction connector of compressor
lead wire.
if the same error code appears again, PCB(CONTROLLER) should
be replaced.
COMPRESSOR other than described above. COMPRESSOR should be replaced.
A4
protective action against
excess
current AC current detection
UNREASONABLE OPERATION UNDER
OVERLOAD
check the place of installation (blockage of air inlet &
outlet ).
check the excess gas.
ensure the installation position to avoid blockage of air inlet &
outlet.
if excess gas is observed, collect all refrigerant once, then re-
charge with prescribed mass.
DROP OF POWER VOLTAGE check the power voltage (230V) during operation. conrm the power supply voltage. (230V)
MOMENTARY STOP OF POWER (IN CASE
OF LIGHTNING)
restart operation.
A5
abnormal revolution of com-
pressor
UNREASONABLE OPERATION UNDER
OVERLOAD
check the place of installation (blockage of air inlet &
outlet).
check the excess gas.
ensure the installation position to avoid blockage of air inlet &
outlet.
if excess gas is observed, collect all refrigerant once, then re-
charge with prescribed mass.
CLOGGED THE CIRCULATION PUMP AND/
OR HEATING CIRCUIT
check the pump and heating circuit. remove the clog, then restart operation.
DROP OF POWER VOLTAGE check the power voltage (230V) during operation. conrm the power supply voltage. (230V)
MOMENTARY STOP OF POWER (IN CASE
OF LIGHTNING)
restart operation.
COMPRESSOR or PCB (CONTROLLER) other than described above. COMPRESSOR should be replaced.
A6 Suction temp. sensor Error SENSOR, TEMP. SUCTION check the resistance by tester. [see table 2] if the sensor is faulty, it should be replaced.
A7 Defrost temp. sensor Error SENSOR, TEMP. DEFROST check the resistance by tester. [see table 2] if the sensor is faulty, it should be replaced.
A8 Discharge temp. sensor Error SENSOR, TEMP. DISCHARGE check the resistance by tester. [see table 4] (*1) if the sensor is faulty, it should be replaced.
(*1) In case of detecting open circuit of the discharge temperature thermistor, error display appears 10 minutes after start operating.
In case of detecting short circuit of the discharge temperature thermistor, error display appears immediately.
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