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11-4-2. Caution at Servicing
1. After servicing, press the [
] 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
fixed 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,
shortcircuit, 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.
Float SW operation
Operation
continues.
(Outdoor
units stop.)
Displayed when
error is detected.
1. Check the drainage.
1) Amount of residual drain.
2) Drain water piping installation
situation.
2. Float SW operation check
3. Check disconnection of connector.
Not
displayed
Trouble on other
indoor P.C. boards
Operation
continues.
Displayed when
error is detected.
Replace P.C. board.
Wired
Remote
Controller
Communication with
wired remote
conroller is error.
Displayed when
error is detected.
Check wired remote controller
connection.
Indoor P.C.
board
Capacity Date is not
set.
Displayed when
error is detected.
Set Function Code 11 properly.
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 fuse of inverter P.C. board.
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 2 and 3,
replace inverter P.C. board.
If signal stops between indoor
terminal 2 and 3, replace indoor P.C.
board.
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