1
3
7
Check code
[P13] / [47]
(Current code / AI-NET)
Measure voltage between
3
pin (GND (Minus): Black)
and
5
pin (V line (Plus): Yellow) of connector CN210.
Indoor fan motor error
Below DV1.0V
Indoor main P.C. board
(MCC-1510) error
Above DC1.0V
[P.C. board fan motor output voltage (DC) check]
Indoor fan starts rotating by connecting plug socket.
6 Blue
5 Yellow
4 White
3 Black
2 —
1 Red
CN210
Yellow
Black
P.C. board
DC
Check I/F P.C. board.
Is there no clogging of SV3B valve?
Is SV2 valve coil correctly connected?
Is there no leakage of check valve of
main discharge pipe in follower units in which
compressors are driven in cooling operation?
Is there no clogging of SV3B valve of
a unit other than unit with error?
Are balance pipe service valves
of all units fully opened?
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?
Replace clogging parts.
Replace clogging parts.
PMV error
Pd sensor/Ps sensor error
Open fully balance pipe
service valves of all units.
Replace check valve
of main discharge pipe.
Correct connector connection.
(CV2: CN302)
Correct connector connection.
(CN300, CN301)
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
NO
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
FILE NO. SVM-1
40
77
