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9.1.3. The display sign list of self diagnosis code
Signal Symptom Check point Condition Display release
U10 Warning that door is kept open. 1. Close compartment door completely The sign is displayed when PC /
FC door is kept open for more
than 1 minute.
Close the door
2. Door SW PCB Adjust door
3. Door aliment Replace door SW PCB
4. Control PCB Replace control PCB
H01 FC temperature sensor circuit
has trouble.
1. Sensor FC Open or short Replace parts
2. Sensor FC circuit
3. Control PCB
H02 PC temperature sensor circuit
has trouble.
1. Sensor PC Open or short Replace parts
2. Sensor PC circuit
3. Control PCB
H05 Sensor DEFROST circuit has
trouble.
1. Sensor DEFROST open or short
(Note) When DFC is opened,
thermarl fuse is blown because
of too long defrosting time.
Replace parts
2. Sensor DEFROST circuit
3. Control PCB
4. Thermal fuse*
H07 Sensor ATC circuit has trouble. 1. Sensor ATC Open or short Replace parts
2. Sensor ATC circuit
3. Control PCB
4. Operation PCB
H10 SSC, Vegetable compartment
sensor circuit has trouble.
1. Sensor SC circuit Open or short Replace parts
2. Control PCB
H29 FC Fan Motor disconnection /
Lock
1. Fan motor circuit Open or short Replace parts
H31 FC defrost heater circuit has
trouble.
1. FC defrost heater Temperature of defrost Sensor
does not reach cut-off tempera-
ture.
Replace parts
2. Thermal fuse
3. Control PCB
H35 Refrigerating unit has trouble.
(Gas leakage at high pressure
side / Poor compression)
1. High pressure side Even if compressor runs, FC
temperature and PC tempera-
ture would not fall any more.
Replace parts
2. Compressor
H36 Refrigerating unit has trouble.
(Gas leakage at low pressure
side)
1. Low pressure side “H40” and “H36” display repeat-
edly.
Replace parts
H38 Fan Motor has trouble. 1. Fan Motor Fan Motor doesn't rotate. Replace parts
2. Control PCB
H40 IPM & Compressor Protection
Control work.
1. Control PCB Over current flow into IPM for a
long time
Replace parts
2. Compressor
H41 Under voltage protection con-
trol work.
1. Power supply voltage Low voltage add to unit for a
long time.
Replace parts
2. Control PCB
H50 Communication error 1. Control PCB Micro- computer can not read or
write the data.
Replace parts
2. Operation PCB
3. Wire circuit between control PCB and
operation PCB
H51 Control PCB has trouble. 1. Control PCB Emulation initialization judge-
ment error when power supply is
turned on.
Replace parts
H52 Control PCB has trouble. (Volt-
age to compressor)
1. Control PCB Inverter voltage is too high.
Inverter voltage is too low.
Replace parts
H79 Overload protection control
work.
1. Control PCB Overload is detected for 5 times
continuously.
Replace parts
2. Each load
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