Possible cause of malfunction
Thermistor
fault
Protective
device for
compressor is
activated
Indoor thermistor is either open
or damaged.
Outdoor thermistor is either
open or damaged.
Oil sensor fault.
Indoor coil temp. sensor (E1)
Indoor coil temp. sensor (E2)
Indoor coil temp. sensor (E3)
Indoor suction air (room) temp. sensor (TA)
Indoor discharge air temp. sensor (BL)
Comp. No. 1 discharge gas temp. sensor (DISCH1)
Comp. No. 2 discharge gas temp. sensor (DISCH2)
Outdoor No. 1 coil gas temp. sensor
(EXG1)
Outdoor No. 1 coil liquid temp. sensor
(EXL1)
Outdoor air temp. sensor (AIR TEMP)
Outdoor No. 2 coil liquid temp. sensor (EXL2)
Current is not detected when comp. No. 1 is ON.
Discharge gas temperature of the comp. No. 1 is not detected.
Temp. sensor is not seated at the sensor holder.
Compressor No. 2 current trouble (overcurrent)
Compressor No. 2 current trouble (locked)
Compressor No. 2 CT sensor disconnected or short circuit
Low pressure switch is activated.
EEPROM on indoor unit P.C.B. failure
Alarm
message
<<F01>>
<<F02>>
<<F03>>
<<F10>>
<<F11>>
F04
F05
F06
F07
F08
F12
F16
F17
F23
F24
F29
F31
H03
H05
H15
H11
H12
H13
H06
H08
H27
(Disconnection, etc.)
High pressure sensor.
EEPROM on the main or sub outdoor unit PCB has failed.
Compressor No. 2 discharge temp. sensor disconnected
Protective device in indoor unit
Protective device in outdoor
unit is activated.
is activated.
P03
P04
P05
P14
P17
P22
P26
H31
P16
P29
Incorrect discharge temperature. (Comp. No. 1)
Negative (defective) phase.
Incorrect discharge temperature. (Comp. No. 2)
Activation of
protective
device
Outdoor unit fan motor is unusual.
Inverter for compressor is unusual. (DC compressor does not
operate.)
Overcurrent at time of compressor runs more than 80Hz (DCCT
secondary current or ACCT primary current is detected at a time
other than when IPM has tripped.)
Compressor running failure resulting from missing phase in the
compressor wiring, etc. (Start failure not caused by IPM or no gas.)
IPM trip (IPM current or temperature)
Compressor intake port temperature sensor (SCT)
Continued
Protective device for compressor
No. 2 is activated.
Protective device for compressor
No. 1 is activated.
Low-pressure sensor failure
Outdoor No. 2 coil gas temp. sensor (EXG2)
Comp. No. 1 oil sensor
Comp. No. 2 oil sensor
O
2 sensor (detects low oxygen level) activated
Thermal protector in indoor unit fan motor is activated.
Improper wiring connections of ceiling panel.
Float switch is activated.
<<P01>>
<<P09>>
<<P10>>
High pressure switch or over-load relay is activated.
Power supply voltage is unusual. (The voltage is less than 160 V
between L1 and L2 phase.)
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