Toshiba MMU-AP0091H 157, P13 Outdoor liquid back detection error 1. PMV1/PMV2 error, P15 / AE

Check code Check code name Cause of operation

[P13] / [47]	Outdoor liquid back detection error 1. PMV1/PMV2 error
(TCC-L / AI-NET)	2. Pd sensor, Ps sensor error
	3.	Clogging of SV2 circuit
	4.	Clogging of SV3B circuit, balance pipe
	5.	Leakage on main discharge pipe
	6.	Outdoor I/F P.C. board error

Check code	Check code name		Cause of operation
[P15] / [AE]	Gas leak detection	1. Outdoor unit service valve closed
(TCC-L / AI-NET)	TS condition (Sub-code: 01)	2. Outdoor PMV error
		3.	TS1 sensor error
		4.	Refrigerant shortage, clogging refrigerant
			circuit
		5.	4-way valve error
		6.	SV4 circuit error

Are connections of outdoor		NO
PMV1/PMV2 connectors correct?
	YES
		NO
Are operations of outdoor
PMV1/PMV2 normal?

Correct connector connection.

(CN300, CN301)

PMV error

Are service valves at gas and		NO
liquid side fully opened?
	YES
Is outdoor PMV1, 2 normal?
1. Connector connection		NO

Open service valves fully.

YES

2. Wiring
3. Coil	Connectors CN300, 301 White
4. Valve body

Repair outdoor PMV.

Are characteristics of Pd sensor/Ps sensor	NO
output voltage normal?
YES

Pd sensor/Ps sensor error

5. Outdoor I/F P.C. board

YES

157

Is SV2 valve coil correctly connected?		NO
	YES
		YES
Is there any miswiring or
misinstallation on TS1 and TS2 sensors?

Correct connector connection.

(CV2: CN302)

Correct miswiring/installation

Are characteristics of

TS2 sensor resistance normal?

YES

Does not discharge

refrigerant gas bypass to suction side

through 4-way valve?

NO

Replace TS2 sensor. Refer to outdoor unit temperature

sensor characteristics-3.

YES

Check and replace 4-way valve and coil.

NONO

Check I/F P.C. board.

Is there no leakage of

SV41 and 42 valve circuits?

YES

Check mispiping of discharge gas/ suction gas main pipes.

Normal

Is the flow selector unit normal?

Normal

Refrigerant shortage,

clogging, pipe breakage.

NO

Repair SV41 and SV42 circuits.

( Coil, valve body, ) disconnection of cable, etc

Abnormal

Correct piping.

Abnormal

Repair the flow selector unit.

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