Toshiba MMD-AP0071SH-C Service Manual page 99

Check code name Check code name
[L30] / [b6] Interlock in indoor unit
from outside
(d07 / AI-NET)
NO
Is outside device connected
to connector CN80?
YES
NO
Does outside device correctly operate?
YES
Check cause of the operation.
Check code name Check code name
[L31] / [–] Extended IC error
(d07 / AI-NET)
YES
Is there any trouble of
outdoor unit power supply?
NO
Check outdoor I/F P.C. board.
Check code name Check code name
[P01] / [11] Indoor fan motor error
(d07 / AI-NET)
* For the models installed with AC fan motor only
YES
Is there no connection error or
disconnection of CN076 connector?
NO
YES
Is not there mechanical lock of fan motor?
NO
Cause of operation
Outside error was input.
Check indoor P.C. board.
Failure Replace
Check outside device.
Failure Replace
Cause of operation
1. Outdoor unit power error
2. Outdoor I/F P.C. board error
Check power voltage and line.
Check auxiliaty noise, etc.
Cause of operation
1. Cabling error
2. Check fan motor.
Correct cabling circuit for
the connector connection.
Replace fan motor.
Check indoor P.C. board.
Failure Replace
Check code name Check code name
[P03] / [1E] Discharge temp TD1 error
(d07 / AI-NET)
Are service valves of NO
outdoor discharge gas, suction gas,
and liquid pipe fully opened?
YES
Are outdoor PMV1 and PMV2 normal?
1. Connector connection
NO
2. Wiring
3. Coil
* Connector CN300, 301 White
4. Valve itself
5. Outdoor P.C. board
YES
NO
Is resistance characteristic
of TD1 sensor normal?
Refer to Outdoor unit temperature
sensor characteristics-4.
YES
NO
Is there no refrigerant leakage of
discharge gas to suction side in 4-way valve?
YES
SV4 circuit
NO
1. Are not coils of SV41 and
SV42 valves mounted reversely?
2. Is no leakage from SV41?
YES
Abnormal
Check leakage of SV5 circuit.
Normal
Abnormal
Check clogging of SV6 circuit.
Normal
Abnormal
Check mispiping of discharge gas /
suction gas main pipes.
Normal
NO
Is the flow selector unit normal?
YES
NO
Is not indoor unit in other
refrigerant line connected?
YES
(Check there is no pipe breakage, and then recharge refrigerant.)
Refrigerant short, clogging, pipe breakage
Cause of operation
1. Service valve of outdoor unit closed.
2. Outdoor PMV1, 2 error
3. TD sensor error
4. Refrigerant short, clogging in pipe
5. 4-way valve error
6. SV4 circuit leakage, misinstallation
7. SV5 circuit leakage
8. SV6 circuit clogging
9. Discharge gas/Suction gas pipes mispiping
10. Flow selector unit error
Open service valves fully.
Repair outdoor PMV.
Replace TD1.
Check 4-way valve.
Correct mounting of valve coils
or replace SV41 valve.
Replace defective parts.
Replace defective parts.
Correct piping.
Repair flow selector unit.
Correct wiring.