Toshiba MMU-AP0091H 158, P15 / AE Gas leak detection, P17 / bb Discharge temp TD2 error

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

Check code Check code name Cause of operation

[P17] / [bb]	Discharge temp TD2 error	1. Outdoor unit service valve closed
(TCC-L / AI-NET)		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 on gas		NO
and the liquid sides fully opened?
	YES

Open the service valves fully.

9. Mispiping of discharge gas/suction gas pipes

10. Flow selector unit error

Is outdoor PMV1, 2 normal?
1. Connector connection	NO
2. Cabling
3. Coil	**Connectors CN300, 301 White
4. Valve body
5. Outdoor I/F P.C. board

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.

158

Are characteristics of

TD1, TD2 sensor resistance normal?

YES

Is SV4 valve circuit normal?

(Coil misinstallation, valve leakage)

YES

Are there indoor units connected

in different refrigerant circuit?

NO

Refer to outdoor unit temperature sensor characteristics-4.

NO

NO

Replace TD1 or TD2 sensor.

Repair SV41 and SV42 circuits.

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

Correct cabling.

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?

NO

*Refer to outdoor unit temperature sensor characteristics-4.

NO

NO

Replace TD2 sensor.

Check 4-way valve.

Correct installation of valve coil.

	YES
Check leakage of		Abnormal
			Replace defective parts.
SV5 and SV11 circuits.
	Normal

2. Is there no leakage through

SV42 circuit?

YES

Check leakage of SV5 circuit.

YES

NO

Replace SV42 valve.

Replace defective parts.

Check for 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

Are there indoor units connected

in different refrigerant circuit?

YES

NO

NO

NO

NO

( Use the mis-wiring 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 clogging and pipe leakage, ) and then recharge with refrigerant.