– 41 –
Others (Excluding check code)
Lamp indication
Operation Timer Preparing
Simultaneous blinking
Operation Timer Preparing
Alternate blinking
Check code
—
—
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)
Error mode detected by remote controller or central controller
Diagnosis function
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
Judgment and action
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
*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.
