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Troubleshooting
DAMA-SM-21-003
56
Service Diagnosis
4.2 Indoor Unit PCB Abnormality
Error Code
A1
Description
Indoor PCB Abnormality
Method of Error
Detection
The system checks if the On/OFF switch works properly.
Error Decision
Conditions
ON/OFF switch malfunction.
Supposed
Causes
Defective indoor unit PCB.
Defective ON/OFF switch.
Troubleshooting
Caution
Turn off the power
supply
Press the ON/OFF
switch
Can be pressed?
Turn on the power
supply
Is error repeat?
Completed
Completed
Remove the casing
Press the ON/OFF
switch again
Is the ON/OFF
switch can be
pressed?
Turn off the power
supply & replace the
indoor unit PCB
(Display PCB)
Turn on the power
supply
Turn on the power
supply
Is error repeat?
Is error repeat?
Replace the indoor unit PCB.
(Control PCB)
Replace the indoor unit PCB.
(Control PCB)
Yes
Yes
Yes
No
No
No
Completed
No
Replace the
indoor unit PCB.
(Display PCB)
No
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Yes
Yes
DAMA-SM-21-003 -Inverter Multi Split-CTX Series.book Page 56 Wednesday, September 1, 2021 5:44 PM
Summary of Contents for 2MX18AXVJU
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