Toshiba MMU-AP0091H service manual 143, E31 / CF, Indoor TCJ sensor error, Indoor TC2 sensor error

Check code	Check code name		Cause of operation
[E31] / [CF]	IPDU communication error	1. Connection error of communication line
(TCC-L / AI-NET)			between IPDU and I/F P.C. board
		2.	I/F P.C. board error
		3.	IPDU P.C. board error
		4.	External noise
Sub-code:
01: IPDU1 error	02: IPDU2 error

Check code Check code name Cause of operation

[F01] / [0F]	Indoor TCJ sensor error		TCJ sensor Open/Short
(TCC-L / AI-NET)
Is TCJ sensor connector (CN102: Red)		NO
				Correct connection.
on indoor P.C. board normally connected?
	YES

03: IPDU1, 2 error	04: Fan IPDU error
05: IPDU1, fan IPDU error	06: IPDU2, fan IPDU error

07: All IPDU error or communication line error between IPDU-I/F P.C. boards, or outdoor I/F P.C. board error

∗If the fan IPDU is abnormal, be sure to check the voltage output on the fan power P.C. board.

Are characteristics of TCJ sensor resistance value normal? ∗

YES

Check indoor main P.C. board.

Defect ÆReplace

NO

Replace TCJ sensor.

*Indoor unit temperature sensor characteristics See Characteristics-2.

143

Is jumper lead setup on the outdoor I/F P.C. board correct?

(Jumper 7, 8, 9 ON)

YES

Are communication connectors between I/F fan power P.C. board, and IPDU connected?

NO

Is there disconnection on communication line

between IPDU and I/F P.C. board?

NO

NO

Connect the jumper lead.

YES

Correct connection.

YES

Connect the communication line.

Check code Check code name Cause of operation

[F02] / [0d]	Indoor TC2 sensor error		TC2 sensor Open/Short
(TCC-L / AI-NET)
Is TC2 sensor connector (CN101: Black)		NO
				Correct connection.
on indoor P.C. board normally connected?
	YES

Is there voltage between pin 4 and pin 5 of CN600 on I/F P.C. board? (Measure with tester: DC0 to 5 V)

YES

Is there voltage deflection between pin 3 and pin 5 of CN600 on I/F P.C. board? (Measure with tester: DC 0 to 5V, 5 pin GND)

YES

NO

I/F P.C. board error

NO

IPDU P.C. board error

Are characteristics of TC2 sensor

resistance value normal? *

YES

Check indoor main P.C. board.

Defect ÆReplace

NO*

Replace TC2 sensor.

Indoor unit temperature sensor characteristics

See Characteristics-2.

On the fan power supply P.C. board, 1) CN503: Between pins 1 and 5 12V

2)CN503: Between pins 2 and 5 Æ7V

3)Between +5V and GND of CN505: 5V

YES

Replace P.C. board according to auxiliary code.

NO

Replace fan power P.C. board.

Auxiliary code	P.C. board to be replaced
01	IPDU1
02	IPDU2
03	IPDU1, 2

Check code Check code name Cause of operation

[F03] / [93]	Indoor TC1 sensor error		TC1 sensor Open/Short
(TCC-L / AI-NET)
Is TC1 sensor connector (CN100: Brown)		NO
				Correct connection.
on indoor P.C. board normally connected?
	YES

04	Fan IPDU
05	IPDU1, fan IPDU
06	IPDU2, fan IPDU
07	IPDU1, 2, fan IPDU, I/F

Are characteristics of TC1 sensor

resistance value normal? *

YES

Check indoor main P.C. board.

Defect ÆReplace

NO

Replace TC1 sensor.

*Indoor unit temperature sensor characteristics See Characteristics-2.