Toshiba MMU-P0121H Service Manual page 84

Check code
[Ab]
Pressure sensor misconnection
Are pipe connection
positions of Pd sensor/Ps
sensor correct?
YES
Are output voltage
characteristics of Pd sensor/Ps
sensor normal?
YES
Is wiring of compressor normal?
NO
Modify wiring.
Check code
[AE]
TD1 condition gas leak detection
In cooling
*
only model
In there blockage in
the check valve to interrupt
the liquid line?
NO
Replace the check valve
1. Connector misconnection of Pd/Ps sensors
2. Pd/Ps sensor error
3. Compressor inverse operation, compressing error
NO
NO
Is pressure
YES
characteristics normal when
compressor is operating?
Check compressor.
1. Outdoor unit service valve closed
2. Blockage of check valve to interrupt the liquid line.
3. Outdoor PMV A error or cooling bypass PMV B error
4. TD1 sensor error
5. Insufficient refrigerant, blockage in pipe
6. Blockage of indoor filter.
Are gas pipe,liquid pipe,
YES
and service valve of the
outdoor unit fully open?
YES
Is outdoor PMV A normal?
1. Connector connection
2. Wiring
3. Coil
4. Valve unit
5. Outdoor P.C. board
YES YES
Is cooling bypass PMV B normal?
YES
Is resistance characteristics
of TD1 sensor normal?
YES
Is wiring correct?
YES
Insufficient refrigerant,
blockage, pipe breakage
Operation cause
YES
NO
Operation cause
NO
NO
NO
NO
NO
Check miswiring of the outdoor unit
(
according to miswiring check function.
Check there is no blockage or pipe
(
breakage, and then addrefrigerant according
to judgment of refrigerant amount.
3-81
Modify connector connection.
Pd sensor : CN501
[
Ps sensor : CN500
Sensor error
Check interface P.C. board.
Open service valve fully.
Repair outdoor PMV A.
Cooling bypass PMV B error
Replace TD1 sensor.
Set normal wiring.
)
]
)