Panasonic CS-KS12NB41, CS-KS18NB4UW, CZ-18BT1U + CU-KS18NKUA service manual From the previous page a

( Continued from the previous page A. )

( Continued from the previous page B. )

A

B

Yes

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 or connection error

Defect in the indoor unit

in the inter-unit cable

P.C. board

Outdoor Unit

1. Turn OFF the power and wait until the power lamp (LED)

of the outdoor unit controller is turned OFF.

1

2

3

4

5

6

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

unit terminal strip.

(Fig. 3)

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 ?

Condition: E01

Condition: E12

Indoor Unit

Fig. 3

Defect in the outdoor 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.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							Outdoor Unit
1	2	3		4	5	6	1	2	3		4	5	6
					Power							Power
1	2	3
Indoor Unit							1	2	3
							Indoor Unit
			Fig. 4							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.

Condition: E12

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

Condition: E01

Defect in the indoor unit

P.C. board

55