– 177 –
No
No
No
No
No
[P12]
CN333
CN334
Check code CauseCheck code name
Indoor fan motor error
1. Wiring error of fan motor connector
2. Fan motor error
3. Indoor P.C. board error
Turn off power supply.
* Detectable in model equipped with DC fan motor
(4-way cassette, 2-way cassette, 1-way cassette,
concealed duct, wall and ceiling types)
Does fan turn
without trouble when
turning it with
hands?
Is
there connection
error or disconnection on
connectorCN333, CN334 of
indoor P.C. board
(MCC-1402,
MCC-1570)?
Is
resistance value
between each phase at
motor side of fan motor connector
CN333 on indoor P.C.
board (MCC-1402,
MCC-1570)
correct? *1
Is
resistance value
at motor side of fan
motor connector CN334 on
indoor P.C. board (MCC-1402,
MCC-1570)
correct? *2
Is output
of indoor fan motor
position detective signal
correct? *3
Correct connector connection.
Replace indoor fan motor.
Replace indoor fan motor.
Replace indoor fan motor.
Replace indoor fan motor.
Check indoor P.C. board
(MCC-1402, MCC-1570).
Failure
→
Replace
Remove connectors CN333 and CN334 on
indoor P.C. board (MCC-1402, MCC-1570).
*1
• Is not winding 1 (Red lead) to 3 (White lead), 3 (White lead) to 5 (Black lead), 5 (Black
lead) to 1 (Red lead) opened/shorted? → Resistance value should satisfy the follows.
[4-way Cassette type]
AP015 to AP030: Approx. 70 to 100Ω
AP036 to AP042: Approx. 35 to 50Ω
[Ceiling type]
AP018 to AP024: Approx. 30 to 70Ω
AP036 to AP042: Approx. 20 to 50Ω
[High wall type]
Approx. 70 to 100Ω
• Is not grounded between cabinet and 1, 3, 5? → Should be 10MΩ or more.
*2
*3
Ye s
Ye s
Ye s
Ye s
Ye s
Check fan motor position detective signal.
• Measure voltage with tester between 1 and 5 of CN334 on
indoor P.C. board (MCC-1402, MCC-1570) under condition of CN333
and CN334 installed and power-ON.
→ Turn fan slowly with
hands so that pin voltage fluctuates between 0 and 5V.
• Between 4 and 5: 5V
Check resistance value of fan motor position detective circuit.
• Is not winding 1 (Yellow lead) to 4 (Pink lead)
opened/shorted? → Resistance should be 5 to 20kΩ
.
No
No
No
No
No
No
No
No
Ye s
Ye s
Ye s
Ye s
Ye s
Ye s
Ye s
Ye s
[P13]
Check code
CauseCheck code name
Outdoor liquid back detection
error
1. PMV1/PMV2 error
2. Pd sensor, Ps sensor error
3. Clogging of SV2 circuit
4. Clogging of SV3B circuit and/or balance pipe
5. Leakage at a check valve on a main discharge pipe
6. Outdoor I/F P.C. board error
Are
connections of
outdoor PMV1/PMV2/PMV4
connectors
correct?
Are
operations of outdoor
PMV1/PMV2/PMV4
normal?
Are
characteristics of
Pd sensor/Ps sensor
output voltage
normal?
Is
SV2 valve coil
correctly
connected?
Are
balance pipe
service valves of
all units fully
opened?
Is there no
clogging of SV3B
valve?
Is there no
clogging of SV3B valve
of any other unit than
malfunctioning
one?
Correct connector connection.
(PMV1: CN300, PMV2:
CN301, PMV4: CN303)
PMV error
Pd sensor/Ps sensor error
Correct connector connection.
(SV2: CN311)
Open fully balance pipe
service valves of all units.
Replace clogging parts.
Replace clogging parts.
Replace check valve of main
discharge pipe.
Check I/F P.C. board.
Is there no leakage of
check valve of main
discharge pipe in follower
units in which compressors
are driven in cooling
operation?
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