– 40 –
Check code
Location
of
detection
De
s
cription
S
y
s
tem
s
tatu
s
Check code detection
condition(
s
)
Check item
s
(location
s
)
• Check for connection
trouble involving Ps sensor
and Pd sensor connectors.
• Check connection of Ps
sensor connector.
• Check for failure in Ps
sensor.
• Check for compressor
poor compression.
• Check for failure in 4-way
valve.
• Check for failure in outdoor
P.C. board (I/F).
• Check for failure in SV4
circuit.
Ps sensor
trouble
I/F
All stop
Output voltage of Ps
sensor is zero.
F23
F23
—
• Check connection of Pd
sensor connector.
• Check for failure in Pd
sensor.
• Check for failure in outdoor
P.C. board (I/F).
Pd sensor
trouble
I/F
All stop
Output voltage of Pd sensor
is zero (sensor open-
circuited).
Pd > 4.15MPa despite
compressor having been
turned off.
F24
F24
—
• Check for failure in indoor
P.C. board (failure
EEPROM)
Other indoor
trouble
Indoor unit
Stop of
corresponding
unit
Indoor P.C. board does not
operate normally.
F29
—
—
• Check power supply
voltage.
• Check power supply noise.
• Check for failure in outdoor
P.C. board (I/F).
Outdoor
EEPROM
trouble
I/F
All stop *1
Outdoor P.C. board (I/F)
does not operate normally.
F31
F31
—
• Check power supply
voltage. (AC380V ± 10%).
• Check for failure in
compressor.
• Check for possible cause
of abnormal overloading.
• Check for failure in outdoor
P.C. board (Compressor).
Compressor
breakdown
Compressor
P.C. board
1
∗
: Compressor
1
side
2
∗
: Compressor
2
side
All stop
Inverter current detection
circuit detects overcurrent
and shuts system down.
H01
H01
• Check current detection
circuit wiring.
• Check failure in outdoor
P.C. board (Compressor).
Current
detection
circuit trouble
Compressor
P.C. board
1
∗
: Compressor
1
side
2
∗
: Compressor
2
side
All stop
Current flow of at least
specified magnitude is
detected despite inverter
compressor having been
shut turned off.
H03
H03
• Check for failure in
compressor.
• Check power supply
voltage. (AC380V ± 10%).
• Check compressor system
wiring, particularly for open
phase.
• Check connection of
connectors/terminals on
compressor P.C. board.
• Check conductivity of case
heater.
(Check for refrigerant
problem inside
compressor.)
• Check for failure in outdoor
P.C. board (Compressor).
• Check outdoor MG-CTT.
Compressor
trouble (lockup)
MG-CTT trouble
Compressor
P.C. board
1
∗
: Compressor
1
side
2
∗
: Compressor
2
side
All stop
Overcurrent is detected
several seconds after
startup of inverter
compressor.
H02
H02
*1 Total shutdown in case of header unit
Continued operation in case of follower unit
Main
remote
controller
Outdoor 7-
s
egment di
s
play
Check
code
S
ub-code
• Check connection of high-
pressure Pd sensor
connector.
• Check connection of low-
pressure Ps sensor
connector.
• Check for failure in
pressure sensors Pd and
Ps.
• Check for trouble in
outdoor P.C. board (I/F).
• Check for compressor
poor compression.
Outdoor
pressure
sensor wiring
trouble (Pd, Ps)
I/F
All stop
Readings of high-pressure
Pd sensor and low-pressure
Ps sensor are switched.
Output voltages of both
sensors are zero.
F16
F16
—
