Toshiba MMU-AP0121MH - Manual (Page 84)

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Check code name
[P13]
Check code name
Outdoor liquid back detection error
Cause of operation
1. PMV1/PMV2 error
2. Pd sensor, Ps sensor error
3. Clogging of SV2 circuit
4. Clogging of SV3B circuit, balance pipe
5. Leakage of main discharge pipe
6. Outdoor I/F P.C. board error
Check I/F P.C. board.
Is SV2 valve coil correctly connected?
Is there no miswiring or
misinstallation on TS1 and TS2 sensors?
Are connections of outdoor
PMV1/PMV2 connectors correct?
Are operations of outdoor
PMV1/PMV2 normal?
Are characteristics of Pd sensor/Ps sensor
output voltage normal?
PMV error
Pd sensor/Ps sensor error
Correct connector connection.
(CV2: CN302)
Correct connector connection.
(CN300, CN301)
Correct miswiring/installation
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
Check code name
[P15]
Check code name
Gas leak detection
TS condition (Auxiliary code : 01)
Cause of operation
1. Outdoor unit service valve closed
2. Outdoor PMV error
3. TS1 sensor error
4. Refrigerant shortage, clogging refrigerant
circuit
5. 4-way valve error
6. SV4 circuit error
( )
Open service valves fully.
Repair outdoor PMV.
Replace TS2 sensor.
Check and replace 4-way valve and coil.
Repair SV41 and SV42 circuits.
Are service valves at gas and
liquid side fully opened?
Are characteristics of
TS2 sensor resistance normal?
Is there no leakage of
SV41 and 42 valve circuits?
Refrigerant shortage,
clogging, pipe breakage.
Connectors CN300, 301 White
Refer to outdoor unit temperature
sensor characteristics-3.
(Check there is no clogging and pipe breakage, and then recharge refrigerant.)
Coil, valve body,
disconnection of cable, etc
Is outdoor PMV1, 2 normal?
1. Connector connection
2. Wiring
3. Coil
4. Valve body
5. Outdoor I/F P.C. board
Normal
Normal
YES
YES
YES
YES
NO
NO
Correct piping. Check mispiping of discharge gas/
suction gas main pipes.
YES
Abnormal
Repair the flow selector unit.
Abnormal
NO
NO
NO
Does not discharge
refrigerant gas bypass to suction side
through 4-way valve?
Is the flow selector unit normal?