MULTI TYPE

Main
remote
controller
Check code
Outdoor 7-segment display
Check
code
Sub-code
AI-NET central
control
remote
controller
F29 – – 12
F31 F31 – 1C
H01
H02
H03
H01
H02
H03
01: Compressor 1
side
02: Compressor 2
side
03: Compressor 3
side
01: Compressor 1
side
02: Compressor 2
side
03: Compressor 3
side
01: Compressor 1
side
02: Compressor 2
side
03: Compressor 3
side
H05 H05 –
*1 Total shutdown in case of header unit
Continued operation in case of follower unit
1F
1d
17
H06 H06 – 20
Location
of
detection
Indoor
unit
I/F
IPDU
IPDU
IPDU
I/F
I/F
Description
Other indoor
error
Outdoor
EEPROM
error
Compressor
breakdown
Compressor
error (lockup)
MG-CTT error
Current
detection
circuit error
TD1 sensor
miswiring
(incomplete
insertion)
Activation of
low-pressure
protection
System
status
Stop of
corresponding
unit
All stop *1
All stop
All stop
All stop
All stop
All stop
Error detection
condition(s)
Indoor P.C. board does not
operate normally.
Outdoor P.C. board (I/F)
does not operate normally.
Inverter current detection
circuit detects overcurrent
and shuts system down.
Overcurrent is detected
several seconds after
startup of inverter
compressor.
Current flow of at least
specified magnitude is
detected despite inverter
compressor having been
shut turned off.
Discharge temperature of
compressor 1 (TD1) does
not increase despite
compressor being in
operation.
Low-pressure Ps sensor
detects operating pressure
lower than 0.02MPa.
Check items (locations)
• Check for defect in indoor P.C.
board (faulty EEPROM)
• Check power supply voltage.
• Check power supply noise.
• Check for defect in outdoor
P.C. board (I/F).
• Check power supply voltage.
(AC200V ± 10%).
• Check for defect in
compressor.
• Check for possible cause of
abnormal overloading.
• Check for defect in outdoor
P.C. board (A3-IPDU).
• Check for defect in
compressor.
• Check power supply voltage.
(AC200V ± 10%).
• Check compressor system
wiring, particularly for open
phase.
• Check connection of
connectors/terminals on A3-
IPDU P.C. board.
• Check conductivity of case
heater.
(Check for refrigerant
entrapment inside
compressor.)
• Check for defect in outdoor
P.C. board (A3-IPDU).
• Check outdoor MG-CTT.
• Check current detection circuit
wiring.
• Check defect in outdoor P.C.
board (A3-IPDU).
• Check installation of TD1
sensor.
• Check connection of TD1
sensor connector and wiring.
• Check resistance
characteristics of TD1 sensor.
• Check for defect in outdoor
P.C. board (I/F).
• Check service valves to
confirm full opening
(both gas and liquid sides).
• Check outdoor PMVs for
clogging (PMV1, 2).
• Check for defect in SV2 or SV4
circuits.
• Check for defect in lowpressure
Ps sensor.
• Check indoor filter for clogging.
• Check valve opening status of
indoor PMV.
• Check refrigerant piping for
clogging.
• Check operation of outdoor fan
(during heating).
• Check for insufficiency in
refrigerant quantity.
MG-CTT: Magnet contactor
183