Toshiba MMU-AP0121MH, MMU-AP0181MH, MMU-AP0151MH Remote Check code, Check item position

54

	Check code
			Detected
Main	Outdoor 7-segment display			Check code name	Status
			position
remote
	Check code	Auxiliary code
controller
F13	F13	01: Compressor 1 side	IPDU	TH sensor error	All stop
		02: Compressor 2 side
F15	F15	—	I/F	Outdoor temp sensor	All stop
				miscabling (TE1, TL)
F16	F16	—	I/F	Outdoor pressure sensor	All stop
				miscabling (Pd, Ps)

F23 F23 — I/F Ps sensor error All stop

F24	F24	—	I/F	Pd sensor error	All stop
F29	—	—	Indoor	Indoor other error	Corresponding
					unit only stops.
F31	F31	—	I/F	Outdoor EEPROM error	All stop (*1)
H01	H01	01: Compressor 1 side	IPDU	Compressor breakdown	All stop
		02: Compressor 2 side
H02	H02	01: Compressor 1 side	IPDU	Compressor error (lock)	All stop
		02: Compressor 2 side		MG-SW error
				OCR operation

Error detection condition Check item (position)

• Resistance value of sensor is infinite or zero	•	IGBT built-in temp sensor error
(Open/Short).		→ Exchange IPDU P.C. board.
During operation of compressor in HEAT mode, the	• Check installation of TE1 sensor and TL sensor.
TE1 detection temp was higher than that of TL by the	• Check characteristics of TE1 and TL sensor resistance value.
specified value continued for 3 minutes or more.
	•	Check outdoor P.C. board (I/F) error.
High-pressure Pd sensor and low-pressure Ps sensor	• Check connection of high-pressure Pd sensor connector.
were exchanged, or output voltages of both sensors	• Check connection of low-pressure Ps sensor connector.
are zero.
	• Check pressure sensors Pd and Ps error.
	•	Check outdoor P.C. board (I/F) error.
	• Check compression error of compressor.
Output voltage of Ps sensor was zero.	• Misconnection of Ps sensor and Pd sensor connectors
	• Check connection of Ps sensor connector.
	• Check Ps sensor error.
	• Check compression error of compressor.
	• Check 4-way valve error.
	•	Check outdoor P.C. board (I/F) error.
	•	Check SV4 circuit error.
Output voltage of Pd sensor was zero. (Sensor Open)	• Check connection of Pd sensor connector.
Pd > 4.15MPa during stop of compressor	• Check Pd sensor error.
	•	Check outdoor P.C. board (I/F) error.
Indoor P.C. board did not operate normally.	• Check indoor P.C. board error (EEPROM error).
Outdoor P.C. board (I/F) did not operate normally.	• Check power voltage.
	• Check power noise.
	•	Check outdoor P.C. board (I/F) error.
Inverter current detection circuit detected over-current	• Check power voltage. (AC220–240V ± 10%).
and stopped.	• Check compressor error.
	• Check cause of abnormal overload operation.
	• Check outdoor P.C. board (IPDU) error.
Over-current was detected several seconds after	• Check compressor error.
header compressor had started.	• Check power voltage. (AC380–10%, 415V +10%).
	• Check cable of compressor and phase-missing.
	• Check connector/terminal connection on IPDU P.C. board.
	• Check conduction of case heater.
		(Check activation error due to liquid stagnation in compressor.)
	• Check outdoor P.C. board (IPDU) error.
	• Check outdoor MG-SW or OCR.

(*1) All stop only in case of the header unit The follower unit continues operation. MG-SW : Magnet Switch, OCR : Over-current Relay