Toshiba MMU-AP0091H service manual 145

Check code	Check code name	Cause of operation
[F15] / [18]	Outdoor temp sensor miscabling 1.	Misinstallation and misconnection of TE1
(TCC-L / AI-NET)	(TE1, TL)	sensor and TL sensor
	2.	Resistance characteristics error of TE1
		sensor and TL sensor

Check code	Check code name	Cause of operation
[F23] / [43]	Ps sensor error	Output voltage error of Ps sensor

(TCC-L / AI-NET)

3. Outdoor P.C. board (I/F) error

Is connection of Ps sensor

connector correct?

NO

Correct connection.

Are installed positions of

TE1 sensor and TL sensor correct?

YES

Are connection of TE1 sensor connector

and TL sensor connector normal?

YES

NO

Outdoor I/F P.C. board

TE1 sensor : CN505, Green

TL sensor : CN521, White

NO

Correct installed positions of TE1 sensor and TL sensor.

Correct connection.

YES

Are output voltage characteristics

of Ps sensor normal?

YES

Connector: CN500, White

NO

Sensor error

*1 Pressure (Check joint) by pressure gauge

2 Pressure display on 7-segment display

3 Output voltage of I/F P.C. board

If 1 and 2, 3 are different, an error of pressure sensor itself is considered. If 2 and 3 are different, check interface P.C. board.

Are resistance characteristics of TL sensor and TE1 sensor normal?

NO

Correct connection.

Is there no leakage	NO	Is not refrigerant by	NO	Check compressor.
		passed from discharge to
from SV4 valve?
		suction of 4-way valve?

YES

*

Check outdoor I/F P.C. board.

Defect ÆReplace

*Outdoor unit temperature sensor characteristics

See TE1 sensor : Characteristics-5.

See TL sensor : Characteristics-3.

	YES		YES
Replace SV4 valve.		Check 4-way valve.

TE1 sensor : Outdoor heat exchanger temp sensor

TL sensor : Temp sensor between liquid tanks of outdoor P.M.V. 1/2

145
	Check code	Check code name		Cause of operation
	[F16] / [43]	Outdoor pressure sensor miscabling	1.	High-pressure Pd sensor and low-
	(TCC-L / AI-NET)	(Pd, Ps)		pressure sensor Ps are exchanged.
			2.	Output voltage of each sensor is zero.

Check code	Check code name	Cause of operation
[F24] / [43]	Pd sensor error	Output voltage error of Pd sensor
(TCC-L / AI-NET)

It is output voltage error of Pd sensor. Check disconnection of connection of connector (Pd sensor: CN501) circuit and output voltage of sensor.

If the sensor is normal, replace outdoor I/F P.C. board.

Are connection of Pd sensor and Ps sensor connectors correct?

YES

Are output voltage characteristics of Pd sensor and Ps sensor normal?

YES

Are Pd/Ps output values Pd > Ps during compressor operation?

YES

Check outdoor I/F P.C. board.

Defect Replace

NO	Correct connection of connectors.
	Pd sensor: CN501, Red
	Ps sensor: CN500, White
NO
	Sensor error Replace

1 Pressure (Check joint) by pressure gauge

2Pressure display on 7-segment display

3Output voltage of I/F P.C. board

If 1 and 2, 3 are different, an error of pressure sensor itself is considered. If 2 and 3 are different, check interface P.C. board.

NO

Check compressor.

*Value can be confirmed by 7-segment display function on outdoor I/F P.C. board.

Pd SW01/02/03=1/1/2 Ps SW01/02/03=1/2/2

Check code Check code name Cause of operation

[F29] / [12]	Indoor other error	Indoor P.C. board error
(TCC-L / AI-NET)		EEROM error

This error is detected during operation of air conditioner of IC10 non-volatile memory (EEPROM) on indoor unit P.C. board. Replace service P.C. board.

∗If EEPROM was not inserted when power was turned on or it is absolutely impossible to read/write EEPROM data, the automatic address mode is repeated. In this case, [97 error] is displayed on AI-NET central controller.

(Approx. 3 minutes)		(Approx. 1 minute)
(Power ON)	[SET DATA] is displayed		[SET DATA]	LED (D02) 1Hz flashes	Reboot
	on main remote controller.		disappears.	for approx. 10 seconds	(Reset)
			(Repetition)	on indoor unit P.C. board.