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Check code
Outdoor 7-segment display
Controller
Check
Sub-code
code
F11
—
—
01: TS1 sensor
trouble
03: TS3 sensor
trouble
F12
F12
04: TS3 sensor
disconnect
1∗: Compressor
1 side
F13
F13
2∗: Compressor
2 side
F15
F15
—
F16
F16
—
F23
F23
—
F24
F24
—
F29
—
—
F31
F31
—
*1 Total shutdown in case of header unit
Continued operation in case of follower unit
Location
Description
System status
of
detection
Indoor unit
Indoor TF
Stop of
sensor trouble
corresponding
unit
I/F
TS1/TS3
All stop
sensor trouble
Compressor
TH sensor
All stop
P.C. board
trouble
I/F
Outdoor
All stop
temperature
sensor wiring
trouble (TE1,
TL1)
I/F
Outdoor
All stop
pressure
sensor wiring
trouble (Pd, Ps)
I/F
Ps sensor
All stop
trouble
I/F
Pd sensor
All stop
trouble
Indoor unit
Other indoor
Stop of
trouble
corresponding
unit
I/F
Outdoor
All stop *1
EEPROM
trouble
- 187 -
Check code detection
Check items (locations)
condition(s)
Sensor resistance is infinity
• Check connection of TF
or zero (open/short circuit).
sensor connector and
wiring.
• Check resistance
characteristics of TF
sensor.
• Check for failure in indoor
P.C. board.
• Sensor resistance is infinity
• Check connection of TS1/
or zero (open/short circuit).
TS3 sensor connector
• When TS3 detects an
• Check resistance
unusual temperature
characteristics of TS1/TS3
during compressor
sensor.
operation and PMV4
• The attachment check of
operation in cooling mode.
TS3 sensor.
• Check for failure in indoor
P.C. board.
Sensor resistance is infinity
• Failure in IPM built-in
or zero (open/short circuit).
temperature sensor
→ Replace Compressor
P.C. board.
During compressor
• Check installation of
operation in HEAT mode,
TE1 and TL1 sensors.
TL1 continuously provides
• Check resistance
temperature reading higher
characteristics of TE1 and
than indicated by TL1 by at
TL1 sensors.
least specified margin for 3
• Check for outdoor P.C.
minutes or more.
board (I/F) trouble
Readings of high-pressure
• Check connection of high-
Pd sensor and low-pressure
pressure Pd sensor
Ps sensor are switched.
connector.
Output voltages of both
• Check connection of low-
sensors are zero.
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.
Output voltage of Ps
• Check for connection
sensor is zero.
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.
Output voltage of Pd sensor
• Check connection of Pd
is zero (sensor open-
sensor connector.
circuited).
• Check for failure in Pd
Pd > 4.15MPa despite
sensor.
compressor having been
• Check for failure in outdoor
turned off.
P.C. board (I/F).
Indoor P.C. board does not
• Check for failure in indoor
operate normally.
P.C. board (failure
EEPROM)
Outdoor P.C. board (I/F)
• Check power supply
does not operate normally.
voltage.
• Check power supply noise.
• Check for failure in outdoor
P.C. board (I/F).
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Table of Contents
Troubleshooting
