Toshiba MMU-AP0181MH, MMU-AP0151MH P15 Gas leak detection, P17, TD condition Auxiliary code

Check code name	Check code name		Cause of operation
[P15]	Gas leak detection	1. Outdoor unit service valve closed
	TD condition (Auxiliary code : 02)	2. Outdoor PMV error
		3.	TD sensor error
		4.	SV4 circuit error
		5.	Refrigerant shortage, clogging refrigerant
			circuit

Check code name	Check code name		Cause of operation
[P17]	Discharge temp TD2 error	1. Outdoor unit service valve closed
		2.	Outdoor PMV error
		3.	TD sensor error
		4.	Refrigerant shortage, clogging of refrigerant circuit
		5.	4-way valve error
		6.	SV4 circuit leakage, misinstallation
		7.	SV5 circuit leakage
		8.	SV6 circuit clogging

Are service valves of gas

and liquid sides fully opened?

YES

NO

Open service valves fully.

9. Mispiping of discharge gas/suction gas pipes

10. Flow selector unit error

Is outdoor PMV1, 2 normal?

1.Connector connection

2.Cabling

3.Coil

4.Valve body

5.Outdoor I/F P.C. board

NO

Connectors CN300, 301 White

Repair outdoor PMV.

Are service valves of gas and

liquid sides fully opened?

YES

Is outdoor PMV normal?

NO

Open service valves fully.

YES

1. Connector connection

2. Cabling

3. Coil

4. Valve body

NO

* Connectors CN300, 301 White

Repair outdoor PMV.

85

Are characteristics of

TD1, TD2 sensor resistance normal?

YES

Is SV4 valve circuit normal?

(Coil misinstallation, valve leakage)

YES

Are not indoor units in different refrigerant circuit connected?

YES

Check leakage of

SV5 and SV11 circuits.

NO

Refer to outdoor unit temperature sensor characteristics-4.

NO

NO

( Check with miscabling check ) function of outdoor unit.

Abnormal

Replace TD1 or TD2 sensor.

Repair SV41 and SV42 circuits.

( Coil, valve body, coil installation, ) disconnection of cable, etc.

Correct cabling.

Replace defective parts.

5. Outdoor I/F P.C. board

YES

Are characteristics of

TD2 sensor resistance normal?

YES

Does not discharge refrigerant gas by pass to suction sidethrough 4-way valve?

YES

SV4 circuit

1.Are not SV41 and SV42 valve coils installed reversely?

2.Is there no leakage through SV42 circuit?

YES

Check leakage of SV5 circuit.

NO

*Refer to outdoor unit temperature sensor characteristics-4.

NO

NO

NO

Replace TD2 sensor.

Check 4-way valve.

Correct installation of valve coil.

Replace SV42 valve.

Replace defective parts.

Normal

YES

Check mispiping of discharge gas/

suction gas main pipes.

Normal

Is the flow selector unit normal?

Normal

Refrigerant shortage,

clogging, pipe breakage.

Abnormal

Correct piping.

Abnormal

Repair the flow selector unit.

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

Check clogging of SV6 circuit.

YES

Check mispiping of discharge gas/

suction gas main pipes.

YES

Is the flow selector unit normal?

YES

Is not an indoor unit of different

refrigerant line connected?

YES

NO

NO

NO

NO

( Check with miscabling check ) function of outdoor unit.

Replace defective parts.

Correct piping.

Repair the flow selector unit.

Correct cabling.

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