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Part 4 Trouble Shooting Guide
7.3.4 Error code 05
Discription Communication Error
• Wrong wiring or missing wire between indoor and outdoor unit cable
• Defect of communication components in indoor unit PCB assembly
• Defect of communication components in outdoor unit PCB assembly
• Defect of power supply components in outdoor unit PCB assembly
• No ground connection in air conditioner unit. (affected by noise in power source)
Supposed
Causes
Yes
No
Wiring connection between
Indoor unit and out door unit
Is right ?
Indoor - Outdoor
1(BR) - 1(BR)
2(BL) - 2(BL)
3(GN/YL) - 3(GN/YL)
4(RD) - 4(RD)
Is the voltage of T/Block
, in outdoor unit about
AC 220/240V ?
Yes
No
Is the voltage of GND & DC5V in
outdoor unit PCB about DC 5V ?
Yes
No
* Check power connector
- Is not connected to the T/Block in
indoor unit.
Check FUSE, NF01/02J, PTC,
Power Module, BD-01S in
outdoor unit PCB assembly
Communication circuit of indoor
& outdoor PCB Is operating
properly?
Ground connection is installed ?
(power outlet or outdoor chassis)
Yes
Install ground connection from
outdoor unit. (In case power outlet
has no earth port)
Check IC01K, IC02K,D01K~D03K,
ZD01K~ZD03K, R01K~R10K,
C01K~C04K
No
No
Yes
Check the noise from another
machine on communication line.
1 2
Earth port
Be sure to disconnect the power cable plug from the plug socket before disassembling the
equipment for a repair. Internal components and circuit boards are at main potential when the
equipment is connected to the power cables. This voltage is extremely dangerous and may
cause death or severe injury if come in contact with it.
Be sure to turn off power switch before connect or disconnect connector, or parts damage may
be occurred.
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