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38MGRBQ: Service Manual
DIAGNOSIS AND SOLUTION (CONT)
Communication malfunction between the indoor and outdoor units diagnosis and solution
Error Code
Malfunction decision conditions
Supposed Causes
Troubleshooting
Indoor / outdoor units communication error
Turn off the all indoor units. Is IPM
power LED or operating LED lamp
NOTE: The Pics (images) mentioned in the flowchart are located on the following pages.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
E2 / EL 01
If the indoor unit does not receive the feedback from outdoor unit during 120 seconds.
Wiring Mistake
Faulty indoor or outdoor PCB
Start: Power off , then Power on the
A/C by the Breaker. (Reconnect the
power wire). Is it still displaying the
error code?
Yes
Check wiring on the outdoor and indoor
terminal follow the wiring diagram. Is all
No
connecting correctly?
Yes
Turn on the indoor unit by
remote. Does the indoor unit display?
No
Yes
Yes
No
on Refer to PIC 2.
?
Yes
Is main board
No
lamp on? Refer PIC 3.
Yes
Is indoor units number correct? Check
on the outdoor check point . (2 for dual
zone, 3 for tri zone, 4 for qua zone).
Refer PIC 4.
No first time
No second time
Change outdoor unit PCB assembly
include wiring
Reconnect the wiring
Reconnect the wiring
Measure Vs, is it moving
alternately between positive value
and negative value? (Vs is the
No
voltage between S and L2). Refer
PIC 1.
Yes
change the IPM
Is the reactor connecting
No
Reconnect the wiring
well
Yes
Change Outdoor Main PCB
A
34
No
No
A:
Is all the wiring between
terminal and Indoor PCB
connect ok?
Yes
Change the Indoor PCB
Power on by remote
controller.
Is it still
displaying the error code
after 3 minutes?
No
Trouble is solved
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