11-4-2 Caution at Servicing
1. After using the service mode of remote controller finished, press the [ ] button to reset the remote controller to
normal function.
2. After finished the diagnosis by the remote controller, turn OFF power supply and turn its ON again to reset the air
conditioner to normal operation. However, the check codes are not deleted from memory of the microcomputer.
3. After servicing finished, press [CLR] button of remote controller under service mode status to send code "7F" to the
indoor unit. The check code stored in memory is cleared.
Table 11-4-1
Block distinction
Operation of diagnosis function
Check
code
Block
Check
code
Cause of operation
Air
conditioner
status
Display flashing
error
Indoor P.C.
Operation
Flashes when
board.
continues.
error is detected.
TA sensor ; The room
temperature sensor is
short-Circuit or disconnection.
1. Check the sensor TA and connection.
2. In case of the sensor and its
connection is normal, check the
P.C. board.
Operation
Flashes when
continues.
error is detected.
1. Check the sensor TC and connection.
2. In case of the sensor and its
connection is normal, check the
P.C. board.
TC sensor ; The heat
exchanger temperature
sensor of the indoor unit
is out of place, disconnection,
short-circuit or migration.
All OFF
Flashes when
error is detected.
1. Check the fan motor and connection.
2. In case of the motor and its
connection is normal, check the
P.C. board.
Fan motor of the indoor unit
is failure, lock-rotor, short-
circuit, disconnection, etc.
Or its circuit on P.C. board
has problem.
Depend on
Depend on
Other trouble on the indoor
P.C. board.
cause of
cause of
failure.
failure.
Action and Judgment
1. Reset power supply.
2. Replace P.C. board.
Outdoor
Unit "OFF"
Indoor Unit
continue
fan only
operation
for 250 minute
or "OFF"
.
Flashes when
error is
detected.
Gas detector sensor failure
1.
Check Gas sensor short
age
/
open.
2. Check Gas sensor disconnect.
Operation
continues.
Flashes when
error is
detected.
Gas detector sensor life time
Replace new sensor.
- 88 -
