Panasonic CS-MKS24NKU, CS-MKS9NKU, CS-MKS18NKU How to Identify a Serial Communication Error, Timer

(3) How to Identify a Serial Communication Error

If the lamps on the main body show the following conditions after the completion of self-diagnosis, a communication error between the indoor unit and outdoor unit might be considered.

In such a case, identify the breakdown section by using the following procedure.

NOTE Refer to "Method of Self-Diagnosis" for the self-diagnosis procedure.

Lamp	Quiet	Timer	Operation
Condition	(3)	(2)	(1)
E01
E12

:Off

:Blinking

:Illuminated

(3-1) Condition: E01

For terminal board short circuit work or inter-unit wiring removal, turn off the power to WARNING avoid an electric shock.

Remove the terminal board short circuit after the completion of self-diagnosis.

Operate the air conditioner in the "TEST RUN" mode.

Does the voltage

between the terminals 1 and 2Yes

on the indoor unit terminal board reach the rated value ?

No

1.Disconnect the inter-unit wiring on the indoor unit side.

2.Operate the system in the "TEST RUN" mode.

1.Short-circuit between the terminals 2 and 3 on the indoor unit terminal board.

2.Operate the system in TEST RUN mode. Then, five minutes later, perform the self-diagnosis.

Condition: E12

What is the self-diagnosis result ?

Does the voltage

between the wires 1 and 2 ofYes inter-unit wiring on the indoor unit side

reach the rated value ?

Condition: E01	An error in the P. C. Board in the
	indoor unit might be considered.

1.Disconnect the inter-unit wiring on the outdoor unit side.

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

3.Operate the system in TEST RUN mode. Then, five minutes later, perform the self-diagnosis.

No	An error in the P. C. Board in the
	indoor unit might be considered.
	(Terminal board error, etc.)

An error in the P. C. Board in the outdoor unit might be considered.

(Connection error between the P. C. Board in

the outdoor unit and J-B)

An error in the inter-unit wiring might be considered.

(ex. wire breaking or connection error, etc.)

Condition: E12

What is the self-diagnosis result ?

	An error in the inter-unit wiring
Condition: E01	might be considered.
	(ex. wire breaking or connection error, etc.)

An error in the P. C. Board in the outdoor unit might be considered.

Connection error between the P. C. Board in

the outdoor unit and J-B)

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