Toshiba MMU-AP0071MH, MMU-AP0181MH, MMU-AP0151MH, MMU-AP0091MH, MMU-AP0121MH F31, H02, H01, H03

Check code name			Check code name		Cause of operation
[F31]		Outdoor EEPROM error		1. Outdoor unit power error (Voltage, noise, etc.)
				2. Outdoor I/F P.C. board error
Is there any trouble of			YES			Check power voltage and line.
						Correct power line.
outdoor unit power supply?
						Check external noise, etc.
	NO
Check I/F P.C. board.

Check code name	Check code name		Cause of operation
[H02]	Compressor error (Lock)	1. Outdoor unit power line error
		2.	Compressor circuit system error
		3.	Compressor error
		4.	Refrigerant stagnation in compressor shell
		5.	IPDU P.C. board error

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

Check code name	Check code name		Cause of operation
[H01]	Compressor breakdown	1. Outdoor unit power line error
		2.	Compressor circuit system error
		3.	Compressor error
		4.	Cause of abnormal overload operation

Is power voltage of

outdoor unit normal? 1

YES

Does voltage drop occur

when other compressor starts?

NO

Does OCR of MG-SW operate?

NO

1 380 – 415V ± 10%

YES

YES

Correct power line.

Reset OCR manually. 3

5. IPDU P.C. board error

NO

73

Auxiliary code : 01: Compressor 1 side

Is power voltage of outdoor unit normal?

YES

Does voltage drop occur

when other compressor starts?

NO

Is connection of wiring or connection of connector on IPDU P.C. board normal?

YES

Is winding resistance

between phases of corresponding

compressor normal? (Note 1)

YES

Is not it an abnormal overload?

NO

02:Compressor 2 side

NO

380 – 415V ± 10%

YES	Correct power line.
NO
	Correct connector connection or wiring.
NO
	Compressor error
YES	(Motor burning, etc.)
	Correct cause of overload.

Take off lead cable of compressor.
1. Check resistance between windings:		C
It is normal if there are 0.7 to 0.9 .	S

2.Check insulation between outdoor cabinet and terminal:

It is normal if there are 10M or more.

Is wiring or connector connection				NO				Correct connector connection
	on IPDU P.C. board normal?							or wiring.
		YES
Is not it an abnormal overload?				YES
								Correct cause of overload.
		NO
				YES			YES
Is there no refrigerant stagnation								Correct refrigerant stagnation
					Is case heater output normal?
	in compressor shell?							in compressor shell.
		NO				NO
	Operation starts.				Check case heater.
				NO
	Is compressor normal? 2							Compressor error
		YES	2 Check the following items mainly.
				1. Existence of abnormal sound and abnormal vibration during operation or starting
	Check IPDU P.C. board.			2. Abnormal overheat of case during operation or stop time (Never touch with hands.)

3.Current of compressor lead during operation or starting time (No varied change of current) change

3 If OCR operates even after manual reset of OCR, check whether the wiring to the current sensor (T02) of Comp-IPDU is correct or not.

Check code name	Check code name		Cause of operation
[H03]	Current detective	1.	Cabling or connector connection error on IPDU P.C. board
	circuit system error	2.	IPDU P.C. board error
Auxiliary code : 01: Compressor 1 side 02: Compressor 2 side

	Check IPDU P.C. board.
Note 1	R

*After checking the output, when connecting the compressor lead again to the compressor terminal, check surely there is no distortion on the Fasten receptacle terminal.

If it is loosened, caulk it with pinchers, etc and then connect	Details of compressor
lead to the terminal firmly.	power connecting section

Wiring or connector connection		NO	Correct connector connection or cabling.
on IPDU P.C. board normal?
	YES
			Check IPDU P.C. board.