III - 9
Service Procedures
3
SM830063
1. Troubleshooting
Thermistor
failure
Fault with
comp. and its
circuit
Possible Cause of Malfunction
Main indoor unit address is not set.
Model setting of indoor unit is not matching the outdoor unit.
When using group control, main indoor unit address setting is duplicated.
(Judging by indoor unit.)
Outdoor unit address (R.C. No.) is duplicated.
Priority setting of indoor unit is duplicated.
—
Improper wiring between indoor units.
(There is group connection wiring in case of individual control.)
Indoor unit address (or group address) is not set.
Capacity code of indoor unit is not set.
Possible cause of Malfunction
Alarm
message
L1
L2
L3
L4
L5
L6
L7
L8
L9
Indoor thermistor is either open
or damaged.
Outdoor thermistor is either
open or damaged.
Protective device for PC comp.
is activated.
Protective device for AC comp.
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.
Indoor room (air-intake) temp. can not be detected.
Discharge air temp. can not be detected.
Discharge gas temp. A (PC comp. =TH01) cannot be detected.
Discharge gas temp. B (AC comp. =TH02) cannot be detected.
Outdoor coil gas temp. (TH04) cannot be detected.
Outdoor coil liquid temp. (TH03) cannot be detected.
Outdoor air suction temp. (TH05)
PC comp. motor is overloaded.
PC comp. motor is locked.
Current of PC comp. cannot be detected when it is turned on.
Current of PC comp. is detected when it is not operated.
PC comp. contactor (Mg SW) is chattering.
AC comp. motor is overloaded.
AC comp. motor is locked.
Current of AC comp. cannot be detected when it is turned on.
Current of AC comp. is detected when it is not operated.
AC comp. contactor (Mg SW) is chattering.
Alarm
message
F1
F2
F3
F10
F11
F4
F5
F6
F7
F8
F29
H1
H2
H3
F27
H9
H11
H12
H13
F28
H19
EEPROM (ICB of PCB) failure
●
PC
:
Power Control
●
AC
:
Standard
●
comp. :
Compressor
●
temp. :
Temperature
NOTE
• Indoor or outdoor unit is not working correctly.
• Control lines between indoor unit, outdoor unit, and system
controller are not wired correctly.
• Same as for C05, above.
• Connector CN1 is not connected correctly.
When using wireless remote controller or system controller,
connect wired remote controller with the indoor unit temporarily
to check the alarm message in detail.
System controller is transmitting
incorrect signal.
System controller is detecting
incorrect signal.
Protective device of the sub-
indoor unit is activated in group
contorl.
• Serial
commu-
nication
errors
• Mis-setting
Activation of
protective
device
Possible Cause of Malfunction (The following messages are displayed only for the system controller.)
Alarm
message
C05
C06
P30