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24
EG
Activation of
protective
device
Thermistor failure
EEPROM of indor unit’s PCB is abnormal.
Fault with
compressor
and its circuit
P1
P2
P3
P4
P5
P6 ~ 8
P9
P10
P11 ~ 17
F1
F2
F3
F4
F6
F7
F8
F9
F29
H1
H2
H3
H4
H5
H6
H7
H8
H10
H11
H12
H13
H14
H15
H16
H17
H18
• Thermal protector in indoor fan motor is activated.
• Thermal protector in outdoor fan motor is activated.
• Compressor thermal protector is activated.
• Power supply voltage is abnormal (More than 260 V or less than 160 V
between L and N phase.)
Discharge gas temperature is abnormal.
High pressure switch is activated.
Power supply voltage is abnormal. Negative phase or defective phase.
–
Improper wiring connections of ceiling panel.
Float switch is activated.
–
Indoor coil temp. (E1 = TH1) cannot be detected.
Indoor coil temp. (E2 = TH2) cannot be detected.
Indoor coil temp. (E3 = TH3) cannot be detected.
Discharge gas temp. A (TH0A) cannot be detected.
Outdoor coil liquid temp. (C1 = TH0E) cannot be detected.
Outdoor coil gas temp. (C2 = TH0C) cannot be detected.
–
• Other thermistor is either open or damaged.
Compressor motor is overloaded.
Compressor motor is locked.
Compressor current detection circuit is abnormal.
–
–
Low pressure protector is activated (low pressure switch or low pressure prevention)
–
–
–
–
–
–
–
–
–
–
Compressor contactor (Mg SW) is chattering.
Protective device in indoor unit is
activated.
Protective device in outdoor unit is
activated.
Protective device in indoor unit is
activated.
Indoor thermistor is either open or
damaged.
Outdoor thermistor is either open
or damaged.
Protective device for compressor
is activated.
Possible cause of trouble
Alarm
message
Main indoor unit address is not set. (Group control setting of indoor unit is abnormal.)
L1
Model setting of indoor unit is not matching the outdoor unit.
L2
When using group control, main indoor unit address setting is duplicated. (Judging by indoor unit.)
L3
Indoor unit address is duplicated.
L4
Priority setting of indoor unit is duplicated.
L5
–
L6
Improper wiring between indoor unit. (There is group connection wiring in case of individual control.)
L7
Indoor unit address (or group address) is not set.
L8
Capacity code of indoor unit is not set.
L9
Capacity code of outdoor unit is not set.
L10
Improper wiring of group control wiring.
L11
Model setting of indoor unit is not proper.
L13