Toshiba MMU-AP0121MH - Manual (Page 81)

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