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11-4-2. Check Code
1. After servicing, press the START/STOP button to return to the normal mode.
2. After servicing by the check code, turn off breaker of the power supply, and turn on breaker of the power
supply again so that memory in the microcomputer returns the initial status.
However, the check codes are not deleted even if the power supply is turned off because they are stored in
the fi xed memory.
3. After servicing, press [CLR] button under check mode status and then send the check code “7F” to the
indoor unit. The error code stored in memory is cleared.
Table 11-4-1
Block distinction Operation of diagnosis function
Judgment and action
Check
code
Block
Check
code
Cause of operation
Air
conditioner
status
Remarks
Indoor P.C.
board etc.
Short-circuit or
disconnection of the
room temperature
sensor (TA sensor).
Operation
continues.
Displayed when
error is detected.
1. Check the room temp. sensor.
2. When the room temp. sensor is
normal, check P.C. board.
Being out of place,
disconnection, short-
circuit, or migration of
heat exchanger sensor
(TC sensor)
Operation
continues.
Displayed when
error is detected.
1. Check heat exchanger sensor.
2. When heat exchanger sensor is
normal, check P.C. board.
Being out of place,
disconnection, short-
circuit, or migration of
heat exchanger sensor
(TCj sensor)
Operation
continues.
Displayed when
error is detected.
1. Check heat exchanger sensor.
2. When heat exchanger sensor is
normal, check P.C. board.
Lock of indoor fan or
trouble on the indoor
fan circuit
All off Displayed when
error is detected.
1. Check the motor.
2. When the motor is normal, check P.C.
board.
Not
displayed
Trouble on other indoor
P.C. boards
Operation
continues.
Displayed when
error is detected.
Replace P.C. board.
Connecting
cable and
serial signal
Return serial signal is
not sent to indoor side
from operation started.
1) Defective wiring of
connecting cable
2) Operation of
compressor thermo
Gas shortage Gas
leak
Operation
continues.
Flashes when
trouble is detected
on Return serial
signal, and normal
status when signal
is reset.
1. When the outdoor unit never operate:
1) Check connecting cable, and
correct if defective wiring.
2) Check 25A fuse of inverter P.C.
board.
3) Check 3.15A fuse of connecting
cable of inverter unit and outdoor
unit.
2. To display [Other] block during
operation, check compressor thermo.
operation and supply gas (check gas
leak also).
3. Unit operates normally during check.
If return serial signal does not stop
between indoor terminal board 2 and
3, replace inverter P.C. board.
If signal stops between indoor
terminal board 2 and 3, replace indoor
P.C. board.
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