4. Service procedures
1
2
3
4
Section
– 70 –
SM830076
18) Symptom: LCD on the remote controller displays “CHECK H01, H02, H03”.
(compressor current detection)
* Please check the related part described in the following chart after confirming the code
setting (S4) of the outdoor unit’s capacity on the PCB in the outdoor unit.
19) Check the indoor unit (When the alarm of communication failure is not activated)
¶ If the electronic control valve failure occurred in Flexible Combination system
(simultaneous operation system), one indoor unit would not be operated normally, then
the other units won’t be operated either. Due to this, try to detect the troubled unit and
correct it.
Normal
No
Failure in the electronic
control valve activation.
No
Replace the sensor.
Operate the unit in
cooling mode.
(30 minutes after its operation)
• Cooled air comes out.
• Is the temperature of each indoor coil sensor almost
the same? (Refer to the sensor temperature
display function of the remote controller.)
• Does each indoor coil sensor detect the temperature
correctly? (Is there any leakage from the pipe of the
temperature detection section?)
Yes
Yes
0460_M_I
0346_M_I
“CHECK H02” display
Compressor lock detection
• Insufficient voltage
• Comp. motor magnetic contactor
defect
• Refrigerant over-charged
Start
Compressor lock
“CHECK H01” display
Compressor overload
detection
• L3 phase wire disconnected
• Comp. motor magnetic contactor
defect
• Outdoor unit PCB defect
“CHECK H03” display
Compressor current detection
circuit defect
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