External Protection Device Abnormality - Daikin RXSQ24TAVJU Service Manual

SiUS331708EA
4.4

External Protection Device Abnormality

A0
Error Code
Applicable
All indoor units
Models
Method of Error Detect open or short circuit between external input terminals in indoor unit.
Detection
Error Decision When an open circuit occurs between external input terminals with the remote controller set for
Conditions external ON/OFF input.
Supposed
Causes
Troubleshooting
Service Diagnosis
Activation of external protection device
Improper field setting
Defective indoor unit PCB
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
External
protection device
is connected to terminals
T1 and T2 of the indoor
unit terminal
block.
NO
Check the setting state of the
external ON/OFF input by
remote controller.
ON/OFF
input from
outside (mode No.
12, first code No. 1) has
been set to external protection
device input (second
code No. 03) by
remote
controller.
NO
YES
YES
Troubleshooting by Error Code
Actuation of external protection
device.
Change the second code No. to
01 or 02.
Replace the indoor unit main
PCB (A1P).
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