Toshiba MMU-AP0071MH, MMU-AP0181MH P07 Heat sink overheat error, P12, P10 Indoor overflow error

Check code name Check code name Cause of operation

[P07]	Heat sink overheat error	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 code name	Check code name		Cause of operation
[P12]	Indoor fan motor error	1.	Cabling error of fan motor connector
		2.	Fan motor error
		3.	Indoor P.C. board error

Turn off power supply.

Auxiliary code : 01: Compressor 1 side 02: Compressor 2 side

NO

Is power voltage normal?*

Correct power line.

*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

YES

Is wiring of IPDU normal?

YES

Is indoor fan normal?

YES

* 380–415V ± 10%

NO

NO

Correct wiring such as cable to compressor or connector connection.

Check fan and fan motor.

Is there connection error or

disconnection on connector CN333, CN334

of indoor P.C. board (MCC-1402)?

NO

Remove connectors CN333 and CN334

on indoor P.C. board (MCC-1402).

YES

Correct connector connection.

YES

Is screw between IPDU and heat sink loosened?

NO

YES

s there no clogging of heat sink cooling duct?

Tighten screws.

Correct clogging.

Does fan turn without trouble when turning it with hands?

NO

Replace indoor fan motor.

83

NO

Check IPDU P.C. board.

Check code name Check code name Cause of operation

[P10]	Indoor overflow error	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

YES
Is resistance value between each phase		NO
			Replace indoor fan motor.
at motor side of fan motor connector CN333 on
indoor P.C. board (MCC-1402) correct? *1
YES	*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? ÆResistance value should satisfy the follows.

•Is not grounded between cabinet and 1, 3, 5? ÆShould be 10Wor more

Is resistance value at motor side of	NO	Replace indoor fan motor.
fan motor connector CN334 on indoor P.C. board
(MCC-1402) correct? *2

YES *2
Check resistance value of fan motor position detective circuit.
•*Is not winding 1 (Yellow lead) to 4 (Pink lead) opened/shorted? ÆResistance should be 5 to 20kW
Is output of indoor fan motor position	NO	Replace indoor fan motor.

Is float SW connector	NO
(Indoor control P.C. board CN34)

Correct

connector connection.

detective signal correct? *3

connected normally?

YES

NO

Does float SW operate?

YES

NO

Is wiring normal?

YES

Check and correct wiring.

Check indoor P.C. board.

Failure Replace

YES

CN333

3

Check fan motor position detective signal.

•Measure voltage with tester between CN334 1 and 5 on indoor P.C. board (MCC-1402) Æunder 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 indoor P.C. board (MCC-1402).

Failure ÆReplace

NO

Does drain pump operate?

YES

Check drain pipe, etc.

Is power supply to		NO		Check indoor P.C. board.
drain pump normal?				Failure Replace
	YES
Replace drain pump,			• Check there is 380–415V voltage of
and check cabling.
			1-3 pin of CN68 on indoor P.C. board.

CN334