L30 Interlock in indoor unit, P03, L31

Check code name	Check code name	Cause of operation

[L30]	Interlock in indoor unit	Outside error was input.
	from outside

Check code name	Check code name		Cause of operation

[P03]	Discharge temp TD1 error	1. Service valve of outdoor unit closed.
		2.	Outdoor PMV1, 2 error
		3.	TD sensor error
		4.	Refrigerant short, clogging in pipe

Is outside device connected		NO
to connector CN80?
	YES
	YES
		NO
		NO

Does outside device correctly operate?

YES

Check indoor P.C. board.

Failure Replace

Check outside device.

Failure Replace

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

Check cause of the operation.

	Check code name		Check code name			Cause of operation

	[L31]		Extended IC error		1.	Outdoor unit power error
					2.	Outdoor I/F P.C. board error

				YES
	Is there any trouble of			YES			Check power voltage and line.
	Is there any trouble of						Check power voltage and line.
81	outdoor unit power supply?						Check auxiliaty noise, etc.
		NO

Check outdoor I/F P.C. board.

Check code name

Cause of operation

[P01]	Indoor fan motor error	1.	Cabling error
		2.	Check fan motor.

* For the models installed with AC fan motor only

outdoor discharge gas, suction gas,

and liquid pipe fully opened?

YES

Are outdoor PMV1 and PMV2 normal?

1.Connector connection

2.Wiring

3.Coil

4.Valve itself

5.Outdoor P.C. board

YES

Is resistance characteristic

of TD1 sensor normal?

YES

Is there no refrigerant leakage of

discharge gas to suction side in 4-way valve?

YES

SV4 circuit

1.Are not coils of SV41 and

SV42 valves mounted reversely?

2.Is no leakage from SV41?

YES

Check leakage of SV5 circuit.

Normal

Check clogging of SV6 circuit.

Normal

* Connector CN300, 301 White

Refer to Outdoor unit temperature sensor characteristics-4.

Abnormal

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.

Is there no connection error or		YES
disconnection of CN076 connector?
	NO
	NO
		YES
		YES

Is not there mechanical lock of fan motor?

Correct cabling circuit for the connector connection.

Replace fan motor.

Check indoor P.C. board.

Failure Replace

Check mispiping of discharge gas /

suction gas main pipes.

Normal

Is the flow selector unit normal?

YES

Is not indoor unit in other refrigerant line connected?

YES

Abnormal

Correct piping.

Repair flow selector unit.

Correct wiring.

Refrigerant short, clogging, pipe breakage	(Check there is no pipe breakage, and then recharge refrigerant.)

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Toshiba MMU-AP0151MH L30 Interlock in indoor unit, P03, L31, P01 Indoor fan motor error

Models: MMU-AP0181MH MMU-AP0071MH MMU-AP0091MH MMU-AP0151MH MMU-AP0121MH

[L30]

Interlock in indoor unit

[P03]

Discharge temp TD1 error

[L31]

Extended IC error

[P01]

Indoor fan motor error

MMU-AP0181MH, MMU-AP0071MH, MMU-AP0091MH, MMU-AP0151MH, MMU-AP0121MH specifications