Toshiba MMU-AP0121MH - Manual (Page 72)

72
YES
YES
YES
NO
NO
NO
Are installed positions of
TE1 sensor and TL sensor correct?
Are connection of TE1 sensor connector
and TL sensor connector normal?
Are resistance characteristics of
TL sensor and TE1 sensor normal?
Check outdoor I/F P.C. board.
Defect Replace
Correct connection of connectors.
Correct connection of connectors.
Correct installed positions of
TE1 sensor and TL sensor.
Outdoor unit temperature sensor characteristics
See TE1 sensor : Characteristics-5.
See TL sensor
: Characteristics-3.
TE1 sensor : Outdoor heat exchanger temp sensor
TL sensor : Temp sensor between liquid tanks of outdoor PMV1/2
Outdoor I/F P.C. board
TE1 sensor : CN505, Green
TL sensor : CN521, White
Check code name
[F15]
Check code name
Outdoor temp sensor miscabling
(TE1, TL)
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
YES
YES
YES
NO
NO
NO
Sensor error Replace
Correct connection of connectors.
Pd sensor: CN501, Red
Ps sensor: CN500, White Are connection of Pd sensor and
Ps sensor connectors correct?
Are output voltage characteristics of
Pd sensor and Ps sensor normal?
Are Pd/Ps output values Pd > Ps
during compressor operation?
Check outdoor I/F P.C. board.
Defect Replace
* 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
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.
Check compressor.
Check code name
[F16]
Check code name
Outdoor pressure sensor miscabling
(Pd, Ps)
Cause of operation
1. High-pressure Pd sensor and low-
pressure sensor Ps are exchanged.
2. Output voltage of each sensor is zero.
Check code name
[F23]
Check code name
Ps sensor error
Cause of operation
Output voltage error of Ps sensor
YES
YES
YES
NO
NO
Is not refrigerant by
passed from discharge to
suction of 4-way valve?
Sensor error
Is connection of Ps sensor
connector correct?
Are output voltage characteristics
of Ps sensor normal?
Is there no leakage
from SV4 valve?
Replace SV4 valve.
YES
NO NO
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.
Connector: CN500, White
Correct connection of connector.
Check 4-way valve.
Check compressor.
Check code name
[F24]
Check code name
Pd sensor error
Cause of operation
Output voltage error of Pd sensor
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.
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.
[SET DATA]
disappears. LED (D02) 1Hz flashes
for approx. 10 seconds
on indoor unit P.C. board.
Reboot
(Reset)
(Repetition)
Check code name
[F29]
Check code name
Indoor other error
Cause of operation
Indoor P.C. board error
EEROM error