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4. Service procedures
1
2
3
4
Section
SM830082
IV - 6
(3) Meanings of alarm messages
When using group control, main indoor unit address setting is duplicated.
(For single heat pump type.)
Error in Auto. address setting.
(No. or capacity of judged indoor unit is small.)
Error in Auto. address setting.
(No. or capacity of judged indoor unit is large.)
Indoor unit is detecting error signal from another indoor unit.
• Indoor unit is detecting error signal from the remote controller.
(No serial communications signal)
Remote controller is detecting
error signal from indoor unit.
Indoor unit is detecting error
signal from outdoor unit.
Outdoor unit is detecting error
signal from indoor unit.
Indoor unit is not working
correctly.
Outdoor unit is transmitting error
signal.
Improper setting of indoor unit or
remote controller.
• Serial
commu-
nication
errors
• Mis-setting
Possible Cause of Malfunction
Alarm
message
E1
E2
E3
E4
E5
E6
E7
E8
E9
E12
E14
E15
E16
E18
Protective device in indoor unit
is activated.
Protective device in outdoor
unit is activated.
Protective device in indoor unit
is activated.
Activation of
protective
device
NOTE
● RCU : Remote Control Unit (remote controller)
● R.C. : Refrigerant Circuit
● comp. : Compressor
● temp. : Temperature
● PCB : Printed Circuit Board
P1
P2
P3
P4
P5
P17
P9
P10
• Thermal protector in indoor fan motor is activated.
• Thermal protector in outdoor fan motor is activated.
• Comp. thermal protector is activated.
Incorrect discharge gas temp. of comp.
High-pressure switch is activated.
Incorrect power supply voltage . Negative phase, defective
phase or voltage drop.
Incorrect discharge gas temp. of comp.
Improper wiring connections of ceiling panel.
Float switch is activated.