MG-CTT: Magnet contactor
*1 Total shutdown in case of header unit
Continued operation in case of follower unit
Check code
Location
of
detection
Description
System
status
Trouble
detection
condition(s)
Check items (locations)
Main
remote
controller
Outdoor 7-segment display
Check
code
Sub-code
F29 –
–
Indoor
unit
Other indoor
trouble
Stop of
corresponding
unit
Indoor P.C. board does not
operate normally.
• Check for defect in indoor P.C.
board (faulty EEPROM)
F31 F31
–
I/F
Outdoor
EEPROM
trouble
All stop *1
Outdoor P.C. board (I/F)
does not operate normally.
• Check power supply voltage.
• Check power supply noise.
• Check for defect in outdoor
P.C. board (I/F).
H01 H01
01: Compressor 1 side
02: Compressor 2 side
IPDU
Compressor
breakdown
All stop
Inverter current detection
circuit detects overcurrent
and shuts system down.
• Check power supply voltage.
(AC380-415V ± 10%).
• Check for defect in
compressor.
• Check for possible cause of
abnormal overloading.
• Check for defect in outdoor
P.C. board (A3-IPDU).
H02 H02
01: Compressor 1 side
02: Compressor 2 side
IPDU
Compressor
trouble
(lockup)
MG-CTT
trouble
All stop
Overcurrent is detected
several seconds after
startup of inverter
compressor.
• Check for defect in
compressor.
• Check power supply voltage.
(AC380-415V ± 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
problem
inside
compressor.)
• Check for defect in outdoor
P.C. board (A3-IPDU).
• Check outdoor MG-CTT.
H03 H03
01: Compressor 1 side
02: Compressor 2 side
IPDU
Current
detection
circuit
trouble
All stop
Current flow of at least
specified magnitude is
detected despite inverter
compressor having been
shut turned off.
• Check current detection circuit
wiring.
• Check defect in outdoor P.C.
board (A3-IPDU).
H05 H05
–
I/F
TD1 sensor
miswiring
(incomplete
insertion)
All stop
Discharge temperature of
compressor 1 (TD1) does
not increase despite
compressor being in
operation.
• 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).
H06 H06
–
I/F
Activation of
low-pressure
protection
All stop
Low-pressure Ps sensor
detects operating pressure
lower than 0.02MPa.
• Check service valves to
confirm full opening
(both gas and liquid sides).
• Check outdoor PMVs for
clogging (PMV1,
3
).
• Check for defect in SV2 or SV4
circuits.
• Check for defect in low-
pressure 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.
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68
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AMP Air Conditioning
www.ampair.co.uk | [email protected]
