Toshiba RAS-25S4KVDG-ND Service Manual page 99

11-4-2. Caution at Servicing
1. After using the service mode of remote controller finished, press the [
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.
Block distinction
Check
Block
code
Indoor P.C.
board.
Operation of diagnosis function
Check
Cause of operation
code
TA sensor ; The room
temperature sensor is
short-Circuit or disconnection.
TC sensor ; The heat
exchanger temperature
sensor of the indoor unit
is out of place, disconnection,
short-circuit or migration.
Gas detector sensor failure
Fan motor of the indoor unit
is failure, lock-rotor, short-
circuit, disconnection, etc.
Or its circuit on P.C. board
has problem.
Other trouble on the indoor
P.C. board.
• Gas detector sensor life time
• Smart sensing failure.
Ionizer sensor failure
] button to reset the remote controller to
Table 11-4-1
Air
Display flashing
conditioner
error
status
Operation Flashes when
continues. error is detected.
Operation Flashes when
continues. error is detected.
Outdoor Flashes when
Unit "OFF" error is
Indoor Unit detected.
continue
fan only
operation
for 250 minute
or "OFF".
All OFF Flashes when
error is detected.
Depend on Depend on
cause of cause of
failure. failure.
Operation Flashes when
continues. error is
detected.
Operation
No flashing
continues.
Operation No flashing
continues.
- 99 -
Action and Judgment
1. Check the sensor TA and connection.
2. In case of the sensor and its
connection is normal, check the
P.C. board.
1. Check the sensor TC and connection.
2. In case of the sensor and its
connection is normal, check the
P.C. board.
1. Check Gas sensor shortage / open.
2. Check Gas sensor disconnect.
1. Check the fan motor and connection.
2. In case of the motor and its
connection is normal, check the
P.C. board.
1. Reset power supply.
2. Replace P.C. board.
Replace new sensor.
1. Check the smart sensing sensor and
connection.
2. In case of the sensor and its connection
is normal, check the P.C.board.
1. Check the Ionizer sensor and
connection.
2. In case of the sensor and its connection
is normal, check the P.C.board.