Troubleshooting By Indication On The Remote Controller; External Protection Device Abnormality - Daikin VRV-WIII RWEYQ72PTJU Service Manual

SiUS30-1301
3. Troubleshooting by Indication on the Remote
Controller
3.1

External Protection Device Abnormality

A0
Error Code
Applicable
All indoor models
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 to
Conditions "external ON/OFF terminal".
 Actuation of external protection device
Supposed
 Improper field setting
Causes
 Defective of indoor unit PCB
Troubleshooting
Service Diagnosis
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
condersing unit (mode
No. 12, first code No. 1) has
been set to external protection
device input (second
code No. 03) by
remote
controller.
NO

Troubleshooting by Indication on the Remote Controller

YES
YES
Actuation of external protection
device.
Change the second code No. to
"01" or "02" .
Replace the indoor unit PCB.
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