P07 Heat sink overheat error, P12 | Toshiba MMU-AP0071MH specs

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

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%

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)?

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?

YES

s there no clogging of heat sink cooling duct?

Tighten screws.

Correct clogging.

Does fan turn without trouble when turning it with hands?

Replace indoor fan motor.

Check IPDU P.C. board.

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
Is resistance value between each phase		NO	Replace indoor fan motor.
at motor side of fan motor connector CN333 on
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)
(Indoor control P.C. board CN34)

Correct

connector connection.

detective signal correct? *3

connected normally?

YES

Does float SW operate?

YES

Is wiring normal?

YES

Check and correct wiring.

Check indoor P.C. board.

Failure Replace

YES

CN333

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

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
	YES

Replace drain pump,			• Check there is 380–415V voltage of
and check cabling.			• Check there is 380–415V voltage of
			1-3 pin of CN68 on indoor P.C. board.

CN334

MMU-AP0181MH, MMU-AP0071MH, MMU-AP0091MH, MMU-AP0151MH, MMU-AP0121MH specifications

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

Models: MMU-AP0181MH MMU-AP0071MH MMU-AP0091MH MMU-AP0151MH MMU-AP0121MH

[P07]

Heat sink overheat error

[P12]

Indoor fan motor error

[P10]

Indoor overflow error

CN333

MMU-AP0181MH, MMU-AP0071MH, MMU-AP0091MH, MMU-AP0151MH, MMU-AP0121MH specifications