Toshiba R410A Service Manual page 145

Check code Check code name
[F15] / [18] Outdoor temp sensor miscabling
(TE1, TL)
(TCC-L / AI-NET)
NO
Are installed positions of
TE1 sensor and TL sensor correct?
Outdoor I/F P.C. board
TE1 sensor : CN505, Green
YES
TL sensor : CN521, White
NO
Are connection of TE1 sensor connector
and TL sensor connector normal?
YES
NO
Are resistance characteristics of
TL sensor and TE1 sensor normal?
YES
* Outdoor unit temperature sensor characteristics
See TE1 sensor : Characteristics-5.
See TL sensor : Characteristics-3.
Check outdoor I/F P.C. board.
Defect ® Replace
* TE1 sensor : Outdoor heat exchanger temp sensor
TL sensor : Temp sensor between liquid tanks of outdoor P.M.V. 1/2
Check code Check code name
[F16] / [43] Outdoor pressure sensor miscabling
(Pd, Ps)
(TCC-L / AI-NET)
NO
Are connection of Pd sensor and
Ps sensor connectors correct?
YES
NO
Are output voltage characteristics of
Pd sensor and Ps sensor normal?
YES
1 Pressure (Check joint) by pressure gauge
2 Pressure display on 7-segment display
3 Output voltage of I/F P.C. board
If 1 and 2, 3 are different, an error of pressure sensor itself is considered.
If 2 and 3 are different, check interface P.C. board.
NO
Are Pd/Ps output values Pd > Ps
during compressor operation?
YES
* Value can be confirmed by 7-segment display function on outdoor I/F P.C. board.
Pd SW01/02/03=1/1/2
Ps SW01/02/03=1/2/2
Check outdoor I/F P.C. board.
Defect Replace
Cause of operation
1. Misinstallation and misconnection of TE1
sensor and TL sensor
2. Resistance characteristics error of TE1
sensor and TL sensor
3. Outdoor P.C. board (I/F) error
Correct installed positions of
TE1 sensor and TL sensor.
Correct connection.
Correct connection.
Cause of operation
1. High-pressure Pd sensor and low-
pressure sensor Ps are exchanged.
2. Output voltage of each sensor is zero.
Correct connection of connectors.
Pd sensor: CN501, Red
Ps sensor: CN500, White
Sensor error Replace
Check compressor.
Check code Check code name
[F23] / [43] Ps sensor error
(TCC-L / AI-NET)
NO
Is connection of Ps sensor
connector correct?
Connector: CN500, White
YES
NO
Are output voltage characteristics
of Ps sensor normal?
YES
* 1 Pressure (Check joint) by pressure gauge
2 Pressure display on 7-segment display
3 Output voltage of I/F P.C. board
If 1 and 2, 3 are different, an error of pressure sensor itself is considered.
If 2 and 3 are different, check interface P.C. board.
NO Is not refrigerant by
Is there no leakage
passed from discharge to
from SV4 valve?
suction of 4-way valve?
YES
Replace SV4 valve. Check 4-way valve.
Check code Check code name
[F24] / [43] Pd sensor error
(TCC-L / AI-NET)
It is output voltage error of Pd sensor. Check disconnection of connection of connector (Pd sensor: CN501) circuit
and output voltage of sensor.
If the sensor is normal, replace outdoor I/F P.C. board.
Check code Check code name
[F29] / [12] Indoor other error
(TCC-L / AI-NET)
This error is detected during operation of air conditioner of IC10 non-volatile memory (EEPROM) on indoor unit P.C.
board. Replace service P.C. board.
If EEPROM was not inserted when power was turned on or it is absolutely impossible to read/write EEPROM data,
the automatic address mode is repeated. In this case, [97 error] is displayed on AI-NET central controller.
(Approx. 3 minutes) (Approx. 1 minute)
(Power ON) [SET DATA] is displayed
on main remote controller.
Cause of operation
Output voltage error of Ps sensor
Correct connection.
Sensor error
NO
Check compressor.
YES
Cause of operation
Output voltage error of Pd sensor
Cause of operation
Indoor P.C. board error
EEROM error
[SET DATA] LED (D02) 1Hz flashes Reboot
disappears. for approx. 10 seconds (Reset)
on indoor unit P.C. board.
(Repetition)