3-3 Communication error (1 minute) between Main and Sub Micoms of an Outdoor unit or among
Outdoor Units (Error Code : E203)
1. Check items
1) Is there power on outdoor unit inverter PBA?
2) Connect the power cable/check the fuse
3) Is there any problem on communication cable between outdoor unit inverter (CN31) <-> Main PBA (CN39)?
4) Check the communication cable connection
2. Check procedure
Yes
End service.
No
Is there any communication error?
Connect the power cable/check the fuse.
1. Is there any problem on the power cable between
outdoor unit main ↔ EMI PBA?
2. Is there any problem on the power cable between
outdoor unit inverter ↔ EMI PBA?
3. Is the fuse (FUSE100) on outdoor unit inverter PBA
normal? (Short-Normal, Open-Abnormal.
Only applies to RD
SSS
HXH
S
series)
No
Yes
Turn off the power and turn it
on again after 30 seconds.
Change the outdoor unit inverter or main PBA.
1. If the 7-segment on the outdoor unit main PBA
shows E203 error, change the PBA → outdoor unit
main PBA is normal.
2. When the LED on the outdoor unit inverter is shown
as following; Red-On, Green-On, Orange-Blinking
and if the 7-segment on the outdoor unit main PBA
does not display anything, change the main PBA →
Outdoor unit inverter PBA is normal.
[Check list for AM
SSSS
XMDC
S
series]
[Check the LED on inverter PBA]
Check the communication cable connection.
No
Yes
[Check list for AM
SSSS
XMDC
S
series]
Is there power on Inverter PBA?
Inverter PBA connector (CN31)
MAIN PBA connector (CN39)
Is there any problem on
communication cable between outdoor unit inverter
(CN31) ↔ Main PBA (CN39)?
[AM
SSSS
XMDC
S
series
inverter PBA LED]
[7-segment on
Main PBA (Common)]
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