Toshiba MMU-AP0091H service manual 127, Detected

• 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.

MG-SW : Magnet Switch, OCR : Over-current Relay

127

		Check code
				Detected	Check code name	Status	Error detection condition		Check item (position)
Main	Outdoor 7-segment display		AI-NET
				position
remote			central control
controller	Check code	Sub-code	remote controller
F13	F13	01: Compressor 1 side	43	IPDU	TH sensor error	All stop	• Resistance value of sensor is	•	IGBT built-in temp sensor error
		02: Compressor 2 side					infinite or zero (Open/Short).		→ Exchange IPDU P.C. board.
F15	F15	—	18	I/F	Outdoor temp sensor	All stop	During operation of	•	Check installation of TE1 sensor and TL sensor.
					miscabling (TE1, TL)		compressor in HEAT mode, the	•	Check characteristics of TE1 and TL sensor resistance value.
							TE1 detection temp was higher	•	Check outdoor P.C. board (I/F) error.
							than that of TL by the specified
							value continued for 3 minutes
							or more.
F16	F16	—	43	I/F	Outdoor pressure	All stop	High-pressure Pd sensor and	• Check connection of high-pressure Pd sensor connector.
					sensor miscabling		low-pressure Ps sensor were	•	Check connection of low-pressure Ps sensor connector.
					(Pd, Ps)		exchanged, or output voltages	• Check pressure sensors Pd and Ps error.
							of both sensors are zero.
								•	Check outdoor P.C. board (I/F) error.
								•	Check compression error of compressor.
F23	F23	—	43	I/F	Ps sensor error	All stop	Output voltage of Ps sensor	•	Misconnection of Ps sensor and Pd sensor connectors
							was zero.	•	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.
F24	F24	—	43	I/F	Pd sensor error	All stop	Output voltage of Pd sensor	•	Check connection of Pd sensor connector.
							was zero. (Sensor Open)	•	Check Pd sensor error.
							Pd > 4.15MPa during stop of	•	Check outdoor P.C. board (I/F) error.
							compressor
F29	—	—	12	Indoor	Indoor other error	Corresponding	Indoor P.C. board did not	•	Check indoor P.C. board error (EEPROM error).
						unit only stops.	operate normally.
F31	F31	—	1C	I/F	Outdoor EEPROM error	All stop (*1)	Outdoor P.C. board (I/F) did not	• Check power voltage.
							operate normally.	•	Check power noise.
								•	Check outdoor P.C. board (I/F) error.
H01	H01	01: Compressor 1 side	1F	IPDU	Compressor breakdown	All stop	Inverter current detection circuit	•	Check power voltage. (AC220–240V ± 10%).
		02: Compressor 2 side					detected over-current and	•	Check compressor error.
							stopped.	•	Check cause of abnormal overload operation.
								•	Check outdoor P.C. board (IPDU) error.
H02	H02	01: Compressor 1 side	1d	IPDU	Compressor error (lock)	All stop	Over-current was detected	•	Check compressor error.
		02: Compressor 2 side			MG-SW error		several seconds after header	• Check power voltage. (AC380–10%, 415V +10%).
					OCR operation		compressor had started.	• Check cable of compressor and phase-missing.

(*1) All stop only in case of the header unit The follower unit continues operation.