(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.
Refer to "Method of Self-Diagnosis" for the self-diagnosis procedure.
Lamp
LED Clean
Timer Operation
:
Off
:
Blinking
Condition
(3) (2) (1)
:
Illuminated
E01
E12
(3-1) Condition: E01
For terminal board short circuit work or inter-unit wiring removal, turn off the power to
avoid an electric shock.
Remove the terminal board short circuit after the completion of self-diagnosis.
No
Ye s
Condition: E12
Condition: E01
Condition: E12
Condition: E01
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.
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)
1. Disconnect the inter-unit wiring on the indoor
unit side.
2. Operate the system in the "TEST RUN" mode.
Ye s
No
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.)
An error in the P. C. Board in the
indoor unit might be considered.
(Terminal board error, etc.)
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.
An error in the P. C. Board in the
indoor unit might be considered.
An error in the inter-unit wiring
might be considered.
(ex. wire breaking or connection error, etc.)
Does the voltage
between the terminals 1 and 2
on the indoor unit terminal board
reach the rated value ?
Does the voltage
between the wires 1 and 2 of
inter-unit wiring on the indoor unit side
reach the rated value ?
What is the self-diagnosis result ?
What is the self-diagnosis result ?
WARNING
Operate the air conditioner
in the "TEST RUN" mode.
NOTE
