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Check code
Outdoor 7-segment display
Sub-code
01: TS1 sensor
F12
03: TS3 sensor
04: TS3 sensor disconnect
F15
–
F16
–
F23
–
F24
–
F31
–
H05
–
H06
–
H07
–
01: TK1 sensor trouble
H08
02: TK2 sensor trouble
H15
–
01: TK1 oil circuit trouble
H16
02: TK2 oil circuit trouble
L04
–
Number of priority indoor units
L06
(check code L05 or L06 depending
on individual unit)
L08
–
L10
–
L17
–
02: Switch setting trouble of
L23
outdoor unit
L28
–
Display of receiving unit
Central
Indicator light block
control or main
remote
Operation Timer Ready
Flash
controller
display
F12
ALT
F15
ALT
F16
ALT
F23
ALT
F24
ALT
F31
SIM Outdoor EEPROM trouble
H05
H06
H07
H08
H15
H16
L04
SIM
L05
SIM
L06
SIM
(L08)
SIM
SIM Outdoor capacity not set
L10
L17
SIM
L23
SIM SW setting trouble
L28
SIM
- 175 -
Typical problem site
Outdoor suction
•
Outdoor suction temperature sensor
•
temperature sensor
(TS1,TS3) has been open/short-circuited.
(TS1,TS3) trouble
When the disconnect of outdoor
•
When TS3 detects an
•
temperature sensor (TS3) is detected.
unusual temperature
during compressor
operation and PMV4
operation in cooling
mode
Outdoor temperature
Wiring trouble in outdoor temperature sensors
sensor (TE1,TL1)
(TE1,TL1) has been detected.
wiring trouble
Outdoor pressure sensor
Wiring trouble in outdoor pressure sensors
(Pd, Ps) wiring trouble
(Pd, Ps) has been detected.
Low pressure sensor (Ps)
Output voltage of low pressure sensor (Ps) is zero.
trouble
Output voltage of high pressure sensor (Pd) is zero
High pressure sensor (Pd)
or provides abnormal readings when compressors
trouble
have been turned off.
Outdoor EEPROM is failure (alarm and shutdown
for header unit and continued operation for follower
unit)
Outdoor discharge
Wiring/installation trouble or detachment of
temperature sensor (TD1)
outdoor discharge temperature sensor (TD1)
wiring trouble
has been detected.
Activation of low-pressure
Low pressure (Ps) sensor detects abnormally low
protection
operating pressure.
Temperature sensor for oil level detection
Low oil level protection
(TK1,TK2) detects abnormally low oil level.
Trouble in temperature
Temperature sensor for oil level detection
sensor for oil level
(TK1,TK2) has been open/short-circuited.
detection
(TK1,TK2)
Outdoor discharge
Wiring/installation trouble or detachment of
temperature sensor (TD2)
outdoor discharge temperature sensor (TD2) has
wiring trouble
been detected.
No temperature change is detected by
Oil level detection circuit
temperature sensor for oil level detection
trouble
(TK1,TK2) despite compressor having been
started.
Identical refrigerant line address has been
Duplicated outdoor
assigned to outdoor units belonging to different
refrigerant line address
refrigerant piping systems.
Duplicated priority indoor
More than one indoor unit have been set up as
unit (as displayed on
priority indoor unit.
priority indoor unit)
Duplicated priority indoor
unit (as displayed on
More than one indoor unit have been set up
indoor unit other than
as priority indoor unit.
priority indoor unit)
Indoor group address not
Address setting have not been performed for one
set
or more indoor units (also detected at indoor end).
Outdoor unit capacity has not been set (after P.C.
board replacement).
Outdoor model
Outdoor unit that cannot be connected is
incompatibility trouble
connected.
Switch setting trouble of outdoor units when
HWM (Hot water module) is connected.
More than six outdoor units have been
Too many outdoor units
connected
connected.
Description of Check code
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Table of Contents
Troubleshooting
