Sanyo CH1872, CH2472 service manual Terminal board Outdoor Unit

( Continued from the previous page A. )

A

Yes

Defect or connection error

in the inter-unit cable

( Continued from the previous page B. )

B

Is the voltage of about DC22V to 24V given between the terminals

2 and 3 on the indoor unit terminal strip

(Serial Communication Line) ?

(Fig. 2)

No

Defect in the indoor unit

P.C. board

1.Turn OFF the power and wait until the power lamp (LED) of the outdoor unit controller is turned OFF.

2.Short-circuit between the terminals 2 and 3 on the outdoor

unit terminal strip.(Fig. 3)

Outdoor Unit

1 2 3 4 5 6

Power

1 2 3

1.Turn ON the power and operate the system using the remote controller or the operation button on the indoor unit.

2.Perform the self-diagnosis five seconds after the operation start.

What is the latest self-diagnosis result ?

Indoor Unit

Fig. 3

Condition: E12	Defect in the outdoor unit
	P.C. board.

Condition: E01

1.Turn off the power and wait until the power lamp (LED) of the outdoor unit controller is turned OFF.

2.Remove the short-circuit between the terminals 2 and 3 on the outdoor unit terminal strip.

3.Disconnect the cable from the terminal 3 on the indoor unit

terminal strip.(Fig. 4)

Short-circuit between the terminals 2 and 3 on the indoor unit
terminal board.	(Fig. 5)

Outdoor Unit

1 2 3 4 5 6

Power 1 2 3

Indoor Unit

Fig. 4

Outdoor Unit

1 2 3 4 5 6

Power

1 2 3

Indoor Unit

Fig. 5

1.Turn ON the power and operate the system using the remote controller or the operation button on the indoor unit.

2.Perform the self-diagnosis five seconds after the operation start.

What is the latest self-diagnosis result ?	Condition: E12	Defect or connection error
		in the inter-unit cable

Condition: E01

Defect in the indoor unit

P.C. board

47