Communication error at
initial operation (3/3)
1. Applicable model
5. Troubleshooting
All models
When the remote control
display is extinguished after the
power on.
Diagnosis Countermeasure
YES
NO
Remote control display is
extinguished after the power on.
NO
NO
YES
Is the
green LED on the indoor unit
flashing?
Is the
fuse on the indoor unit control
PCB OK?
Is
approx. DC10-11V detected
between wires at the remote control
side after disconnecting the
remote control?
Are wires
connected properly between the indoor and
the outdoor units?
Is approx.
DC20V detected between 2/N -
➂ on the outdoor unit terminal
block?
NO
Is approx
DC20V detected between
➁-➂
on the indoor unit terminal
block?
NO
YES
NO
YES
YES
YES
Replace fuse.
Short-circuit on remote
control wire
Defective remote control
Correct wires.
Defective outdoor unit
PCB
➞
Replace.
Defective connection wire
(Broken wire)
Noise
Defective indoor unit
control PCB
➞
Replace.
2. Error detection method
3 .
Condition of error displayed
4. Presumable cause
• Blown fuse
• Connection between PCB’s
• Faulty indoor unit control
PCB
• Defective remote control
• Wire breakage on remote
control
• Faulty outdoor unit PCB
Note:
Error code
Remote control:
LED Green Red
Indoor
Stays OFF
Keeps flashing
Content
'22 • PAC-SM-412
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68
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