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Section
IV - 7
SM830082
4. Service procedures
Thermistor
failure
Fault with
comp. and its
circuit
Possible Cause of Malfunction
Indoor thermistor is either open
or damaged.
Outdoor thermistor is either
open or damaged.
Protective device for comp. is
activated.
EEPROM (ICB of PCB) failure
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.)
Capacity code of indoor unit is not set.
Improper wiring of group control wiring.
Possible cause of Malfunction
• 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.)
● R.C. : Refrigerant Circuit
● comp. : Compressor
● temp. : Temperature
● PCB : Printed Circuit Board
NOTE
Alarm
message
F1
F2
F3
F10
F4
F25
F7
F29
H1
H2
H3
F27
H18
Alarm
message
L2
L3
L4
L5
L6
L7
L9
L11
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 gas temp. (comp. = TH0A) cannot be detected.
Outdoor coil gas temp. (C2 = TH0C) cannot be detected.
Outdoor coil liquid temp. (C1 = TH0D) cannot be detected.
Comp. motor is overloaded.
Comp. motor is locked.
Current of comp. cannot be detected when it is turned on.
Current of comp. is detected when it is not operated.
Comp. contactor (Mg SW) is chattering.
Alarm
message
C05
C06
P30