1-36
TROUBLESHOOTING
“RUN” light flickers and “ALARM” is indicated on the remote control switch.
The unit No., alarm code and the unit code is alternately indicated on the set temperature section,
and the unit No. and alarm code are indicated on the display of the outdoor unit PCB.
This alarm code is indicated when the main power source phase is reversely connected or one
phase is not connected.
Alarm
Code
Abnormality of Picking up Phase Signal
Correctly connect each phase
of power source.
No
Single Phase
(Is there any phase not connected?)
No
Yes
PCB1 is normal
PCB1 is normal
PCB1 is normal
Voltage for unit to
be suspended.
Running Voltage:
"B" V
Power Supply "A" "B"
187
323
342 to 456380-415V, 50Hz
380V, 60Hz
220V, 60Hz
Starting Voltage:
Less than "A" V
Abnormality with Power Source.
Is there any excessively voltage
decrease at power source?
Yes
Correctly connect each phase
of power source.
Faulty PCB1 or other cause.
Refer to next page.
No
Reverse Phase Connection?
Yes
NOTE:
PCB1: Outdoor Unit Printed Circuit Board
342 to 418
198 to 242
Cause
Check Item
Action
(Turn OFF Main Switch)
Phenomenon
Activation of
Reverse Phase
Sensor in
Outdoor Unit
Check it according to
electrical wiring in Page
1-6, 1-7 and 1-9.
Replacing Wires, Repair,
Tightening Screws or
Correct Wiring
Reverse or Single Phase
Replace PCB if
faulty.
Faulty Outdoor Unit PCB
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