162
Troubleshooting
Alarm
Code
3D
Abnormality Transmitting between Main Unit and Sub Unit(s)
● The RUN indicator (Red) is ashing
The indoor unit number, the alarm code, the unit model code and the connected number of indoor units are displayed on
LCD, or the indoor unit number and the alarm code are displayed on the 7-segment of outdoor unit PCB.
★
For the combination of outdoor units, this alarm code is indicated when transmission to outdoor unit B,C or D is NOT
provided for 30 seconds.
(Alarm code “31” will be indicated when transmission to all the outdoor units connected to the transmission terminal
between outdoor units is NOT provided.)
Is LED1 turned ON on PCB
of outdoor unit B, C and D?
Is operating line
between outdoor units
loosened or disconnected?
No
No
Turn ON the power supply.
Replace the PCB of
outdoor unit B, C or D.
Correctly connect the
operating line between
outdoor units. Also, reset
the power supply.
Replace the PCB of
outdoor unit B, C or D.
Check the cause and
replace it.
Yes
Yes
Yes
No
Check the power supply
of outdoor unit.
Is fuse on O.U. PCB
blown out?
Good
Faulty
O.U. PCB: Outdoor Unit PCB
Unit A
(Main)
Unit B
(Sub)
Unit C
(Sub)
Outdoor Unit
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