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Check code
[P12] / [11]
(TCC-L / AI-NET)
Check code name
Indoor fan motor error
Cause of operation
1. Cabling error of fan motor connector
2. Fan motor error
3. Indoor P.C. board error
Turn off power supply.
Correct connector connection.
Check indoor P.C. board (MCC-1402).
Failure Replace
Is resistance value at motor side of
fan motor connector CN334 on indoor P.C. board
(MCC-1402) correct? 2
Is resistance value between each phase
at motor side of fan motor connector CN333 on
indoor P.C. board (MCC-1402) correct? 1
Is there connection error or
disconnection on connector CN333, CN334
of indoor P.C. board (MCC-1402)?
Is output of indoor fan motor position
detective signal correct? 3
Does fan turn without trouble
when turning it with hands?
Remove connectors CN333 and CN334
on indoor P.C. board (MCC-1402).
2
Check
insulation resistance value of fan motor position detective circuit.
• Is winding 1 (Yellow lead) to 4 (Pink lead) opened/shorted? Resistance should be 5 to 20k
3
Check fan motor position detective signal.
• Measure voltage with tester between CN334 1 and 5 on indoor P.C. board (MCC-1402)
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
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 Air Discharge Cassette type]
MMU-AP0091H, AP0301 Approx. 70 to 100
MMU-AP0361H, AP0561 Approx. 35 to 50
[Concealed Duct Standard, Under Ceiling, High Wall type]
15 to 35
•
Check insulation resistance between the cabinet
and 1, 3, 5? Should be 10 or more
Detectable
only in models
with DC fan motor
4-way Air Discharge Cassette, or Concealed Duct Standard type
Under Ceiling, or High Wall type
Replace indoor fan motor.
Replace indoor fan motor.
Replace indoor fan motor.
Replace indoor fan motor.
CN333
CN334
YES
YES
YES
YES
YES
( )
NO
NO
NO
NO
NO
Sub-code: 01: Compressor 1 side 02: Compressor 2 side
Is power voltage normal?*
Is indoor fan normal?
Is there blocking of heat sink cooling duct?
Is fixing between IPDU and heat sink loose?
Check IPDU P.C. board.
Is wiring of IPDU normal?
Correct power line.
Check fan and fan motor.
Tighten screws.
Clear blocking.
* 380–415V ± 10%
Correct wiring such as cable to compressor.
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
Check code
[P07] / [1C]
(TCC-L / AI-NET)
Check code name
Heat sink overheat error
Cause of operation
1. Power voltage error
2. Outdoor fan system error
3. Heat sink installation error
4. Clogging of hear sink cooling duct
5. IPDU P.C. board error (TH sensor error)
• Check there is 220–240 V voltage of
1-3 pin of CN68 on indoor P.C. board.
Check drain pipe, etc.
Does drain pump operate?
Does float SW operate? Is wiring normal?
Is power supply to
drain pump normal?
Replace drain pump,
and check cabling.
Check indoor P.C. board.
Failure Replace
Check indoor P.C. board.
Failure Replace
Check and correct wiring.
Correct
connector connection.
YES
YES
YESYES
YES
NO
NO
NONO
NO
Is float SW connector
(Indoor control P.C. board CN34)
connected normally?
Check code
[P10] / [0b]
(TCC-L / AI-NET)
Check code name
Indoor overflow error
Cause of operation
1. Float SW operation error
2. Drain pump operation error
3. Clogging of drain pipe
4. Indoor P.C. board error
Sub-code: Indoor address with trouble