Panasonic CS-KS18NB4UW, CS-KS12NB41, CZ-18BT1U + CU-KS18NKUA service manual 3-2Condition E12

(3-2) Condition: E12

Troubleshooting Serial Communication

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

2.Disconnect the cable from the terminal 3 on the Outdoor

unit terminal strip. (Fig. 6)

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: E01

What is the latest self-diagnosis result ?

Condition: E12

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

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

unit terminal strip. (Fig. 7)

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: E01

What is the latest self-diagnosis result ?

Condition: E12

Defect in the indoor unit

P.C. board

Outdoor Unit

1 2 3 4 5 6

Power

1 2 3

Indoor Unit

Fig. 6

Defect in the outdoor unit

P.C. board

Outdoor Unit

1 2 3 4 5 6

Power

1 2 3

Indoor Unit

Fig. 7

Defect in the inter-unit

cable

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