External Protection Device Abnormality - Daikin VRV RXYQ72-384XAYCA Service Manual

Troubleshooting by Error Code
3.3

External Protection Device Abnormality

3.3.1 External Protection Device Abnormality (Except FXTQ-TA, FXTQ-TB,
and CXTQ-TA)
Applicable
All indoor unit models (except FXTQ-TA, FXTQ-TB, and CXTQ-TA)
Models
A0
Error Code
Method of Error
Detects 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.
Supposed
 Activation of external protection device
Causes  Improper field setting
 Defective indoor unit control PCB
Troubleshooting
229
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 T1 and T2
of the indoor unit
terminal.
NO
Check the setting state of the
external ON/OFF input by
remote controller.
ON/OFF
input from
outdoor (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
SiUS342004EB
Activation of external protection
device.
Change the second code No. to
01 or 02 .
Replace the indoor unit control
PCB (A1P).
Part 6 Service Diagnosis