Toshiba MMU-AP0121MH User Manual
Page 83
83
Check code name
[P12]
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 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 20k
W
*
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.
• Is not grounded between cabinet and 1, 3, 5?
®
Should be
10
W
or more
Replace indoor fan motor.
Replace indoor fan motor.
Replace indoor fan motor.
Replace indoor fan motor.
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
CN333
CN334
*
Detectable in model with DC fan motor
4-way Air Discharge Cassette or Concealed Duct Standard type
Under Ceiling, High Wall or Compact 4-way Air Discharge Cassette type
( )
Auxiliary code : 01: Compressor 1 side 02: Compressor 2 side
Correct wiring such as cable to compressor
or connector connection.
Is power voltage normal?*
Is indoor fan normal?
s there no clogging of heat sink cooling duct?
Is screw between IPDU and heat sink loosened?
Check IPDU P.C. board.
Is wiring of IPDU normal?
Correct power line.
Check fan and fan motor.
Tighten screws.
Correct clogging.
* 380–415V ± 10%
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
Check code name
[P07]
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 380–415V 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
YES
YES
YES
NO
NO
NO
NO
NO
Is float SW connector
(Indoor control P.C. board CN34)
connected normally?
Check code name
[P10]
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
Auxiliary code : Indoor address with trouble