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MULTI V 5 Outdoor Unit Service Manual
Due to our policy of continuous product innovation, some specifications may change without notification.
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ERROR CODES
Please refer to the Safety Precautions on pages 4-7 for more detail to prevent injury or death regarding the operation and service
troubleshooting of the Multi V product.
WARNING
Error No. 52
Error No. Description Details Causes
52
Master: 521
Slave 1: 522
Slave 2: 523
Communication
error between
outdoor unit in-
verter compressor
PCB(s) and main
PCB.
Outdoor unit main controller (PCB) cannot
receive signal from inverter compressor con-
troller (PCB[s]).
1. Power wiring or communication cable is
disconnected.
2. Defective outdoor unit main fuse / noise
filter.
3. Defective outdoor unit main / inverter
PCB(s).
Is the yellow commu-
nication LED for either the
compressor1 or compressor2
PCB on?
Replace the PCB on either compressor1
or compressor2.
Is the noise filter or Inverter
PCB(s) line fuse normal?
No
Yes
Is the main PCB functioning
normally?
Yes
No
Replace Main PCB.
Is the communication cable
connected properly?
Reconnect communication
cable.
No
Yes
Change the noise filter or
fuse.
Change the Inverter PCB(s).
Checking the Main PCB and Inverter Compressor 1 / Inverter Compressor 2 PCB (If operating normally, the communica-
tion LED will blink)
Fan Board Inverter Compressor
PCB 1
Inverter Compressor
PCB 2
Main PCB
Images here are representative
of system components. Actual
component appearance depends
on model and system type.
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