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9.3. 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
2.Door SW PCB
3. Door aliment
4.Control PCB
The sign is displayed when PC / FC
door is kept open for more than 1
minute.
Close the door, Adjust
the door, Replace the
door SW PCB, Replace
control PCB
H01 FC temperature sensor circuit has
trouble.
1.SensorFC
2.Sensor FC circuit
3.Control PCB
Open or short Replace parts
H02 PC temperature sensor circuit
has trouble.
1.Sensor PC
2.Sensor PC sircuit
3.Control PCB
Open or short Replace parts
H05 Sensor DEFROST circuit has
trouble.
1.Sensor DEFROST
2.Sensor DEFROST circuit
3.Control PCB
4.Thermal fuse*
Open or short
(Note) When DFC is opened,
thermal fuse is blown because of
too long defrosting time.
Replace parts
H07 Sensor ATC circuit has trouble. 1.Sensor ATC
2.Sensor ATC circuit
3.Control PCB
Open or short Replace parts
H10 SSC, Vegetable compartment
sensor circuit has trouble.
1.Sensor SC circuit
2.Control PCB
Open or short Replace parts
H12 PEC sensor circuit has trouble. 1.Sensor PEC
2.Sensor PEC circuit
3.Control PCB
Open or short Sensor PEC can not
replace
H31 FC defrost heater circuit has trou-
ble.
1.FC defrost heater
2.Thermal fuse
3.Control PCB
Temperature of defrost Sensor
does not reach cut-off temperature.
Replace parts
H35 Refrigerating unit has trouble.
(3 way valve / Gas leakage at
high pressure side / Poor com-
pression)
1.3 way valve
2.Gas leakage at high pressure side
3.Poor compression
Even if compressor runs, FC tem-
perature and DEF temperature
would not be below 0
°C continu-
ously.
Replace parts
H36 Refrigerating unit has trouble.
(Gas leakage at low pressure
side)
1.Gas leakage at low pressure side “H40”and “H36” display repeatedly. Replace parts
H40 IPM & Compressor Protection
Control has trouble.
1.Control PCB
2.Compressor(Lock)
Over current flow into IPM for a
long time.
Replace parts
H41 Under voltage protection has
trouble.
1.Power supply voltage
2.Control PCB
Low voltage add to unit for a long
time.
Replace parts
H50 Communication error 1.Control PCB
2.Operation PCB
3.Wire circuit between control PCB and
operation PCB
Micro- computer can not read or
write the data.
Replace parts
H51 Control PCB has trouble. 1.Control PCB Emulation initialization judgment
error when power supply is turned
on.
Replace parts
H52 Control PCB has trouble.(Voltage
to compressor)
1.Control PCB Inverter voltage is too high. Inverter
voltage is too low.
Replace parts
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