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Lamp indication Check code
–
–
TIMER PREPARINGOPERATION
Possible causes
Trial operation in progress
Invalid setting
(Auto cooling/heating setting for auto cooling/heating
unavailable unit or heating setting for cool only unit)
Simultaneous blinking
TIMER PREPARINGOPERATION
Alternate blinking
Error mode detected by remote controller or central controller
Check code
No
indication
(remote
controller
disabled)
E01
*2
E02
E09
L20
Central
controller
L20
–
*3
Central
controller
(Transmission)
C05
(Reception)
C06
–
Central
controller
P30/b7
Possible causes
No communication with
header indoor unit
Remote controller is not
connected correctly.
Indoor unit is not powered
on.
Auto address setting is not
completed.
No communication with
header indoor unit
Disconnection between
remote controller and header
indoor unit (detected by R/C)
Signal transmission error
to indoor unit (detected by
R/C)
Multiple remote controller
headers (detected by R/C)
Duplication of indoor unit
collective address during
communication of central
control system
(detected by indoor unit/
central controller)
Failure of central control
communication circuit
(detected by central
controller)
Failure of indoor unit group
follower unit.
Air conditioner status
OFF
OFF (auto reset)
*Operation
continues under
central control
OFF (auto reset)
*Operation
continues under
central control
OFF (Follower R/C
continues
operation)
OFF (auto reset)
Operation
continues (following
R/C)
Continue/OFF
(depending on
situation)
Conditions
–
Indicated when an
error is detected
Indicated when an
error is detected
Indicated when an
error is detected
Indicated when an
error is detected
Indicated when an
error is detected
Indicated when an
error is detected
Failure of remote controller power
supply or indoor unit EEPROM
1.Check remote controller wires.
2.Check remote controller.
3.Check indoor unit power wiring.
4.Check indoor unit P. C. board.
5.Check indoor unit EEPROM and
insertion into socket.
...
Auto address repetition occurs.
Remote controller signal reception error
1.Check remote controller wires.
2.Check remote controller.
3.Check indoor unit power wiring.
4.Check indoor unit P. C. board.
Remote controller transmission error
1.
Check remote controller transmitter.
... Replace remote controller.
1.
Check for multiple remote
controller headers.
... One header only, others are
follower R/C.
1.Check central control network
address setting.
1.Check communication line,
wrong connection, and indoor
unit power supply.
2.Check communication circuit
(U3, U4, XY terminals).
3.Check central controller
(including central control R/C).
4.Check terminating resistors
(TCC-LINK).
Check the unit's check code with
remote controller
Diagnosis function
Judgment and action
*2
No check code can be indicated by wired remote controller. (Normal operation of air conditioner cannot be controlled by wired remote controller.)
Check codes are indicated by the lamps for wireless models.
*3 This is an error related to communication of remote controller (A, B) or central control system (TCC-LINK U3, U4).
Remote controller indicates E01, E02, E03, E09, E18 or no code according to situation.
Others (Excluding check code)
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