1-35
TROUBLESHOOTING
Yes
Disconnect CN14
of PCB1.
Check the wiring between
PCB1 and PCB3.
(5 to 20HP)
Check the wiring between
PCB1 and ISPM.
(24 and 30HP)
Check PCB3
(5 to 20HP)
Check ISPM
(24 and 30HP)
Check PCB3 and
check the wiring
between PCB1
and PCB3.
(5 to 20HP)
Check ISPM and
check the wiring
between PCB1
and ISPM.
(24 and 30HP)
Faulty PCB1.
No
No
No
Is LED2 (green) on
PCB1 flickering?
Yes
Is LED4 (yellow) on
PCB3 OFF?
Is LED4 (yellow) on
PCB3 flickering?
YesYes
No
Is LED2 (green) on
PCB1 flickering?
Check PCB3
(5 to 20HP)
Check ISPM
(24 and 30HP)
“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 PCB1.
This alarm is indicated when abnormality is maintained for 30 seconds after normal transmitting between the
outdoor unit PCB1 and inverter PCB3, and also abnormality is maintained for 30 seconds after the micro-
computer is automatically reset. The alarm is indicated when the abnormal transmitting is maintained for 30
seconds from starting of the outdoor unit. (In case of 5 to 20HP)
This alarm is indicated when abnormality is maintained for 30 seconds after normal transmitting between the
outdoor unit PCB1 and ISPM, and also abnormality is maintained for 30 seconds after the micro-computer is
automatically reset. The alarm is indicated when the abnormal transmitting is maintained for 30 seconds from
starting of the outdoor unit. (In case of 24 and 30HP)
PCB1: Control PCB in Outdoor Unit
PCB3: Inverter PCB (High Voltage) (5 to 20HP)
ISPM: Inverter System Power Module (24 and 30HP)
Alarm
Code
Abnormal Transmitting between Inverter and Outdoor PCB1, 3
Cause
Check Item
Action
(Turn OFF Main Switch)
Phenomenon
Check continuity.
Check for looseness
of connection screws.
Replacing Wires,
Repairing and
Tightening Screws
Check connection Nos.
Correctly Connect
Wires
Check connections.
Repair wiring
connections.
Replace PCB if faulty.
Between Control PCB
and Inverter PCB
Disconnected
Wires, Insufficient
Contacting or
Incorrect
Connection
Check continuity of
wires.
Check for looseness
of connection screws.
Check connection No.
Replacing wires,
repairing, tightening
screws and incorrect
wiring.
Power Source Wiring
for Outdoor Unit
Disconnected Wires
to PCB
Faulty PCB (PCB1
for Control, PCB3
for Inverter)
(5 to 20HP)
Faulty PCB
Disconnected Wires
Insufficient Contacting
Incorrect Wiring
Incorrect Wiring
Faulty PCB (PCB
for Control, ISPM
for Inverter)
(24 and 30HP)
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