Daikin VRV RXYQ72-384XAYCA, Service Manual

Page: 236 / 419

Troubleshooting by Error Code SiUS342004EB
229 Part 6 Service Diagnosis
3.3 External Protection Device Abnormality
3.3.1 External Protection Device Abnormality (Except FXTQ-TA, FXTQ-TB,
and CXTQ-TA)
Applicable
Models
All indoor unit models (except FXTQ-TA, FXTQ-TB, and CXTQ-TA)
Error Code
A0
Method of Error
Detection
Detects open or short circuit between external input terminals in indoor unit.
Error Decision
Conditions
When an open circuit occurs between external input terminals with the remote controller set to
external ON/OFF terminal.
Supposed
Causes

Activation of external protection device

Improper field setting

Defective indoor unit control PCB
Troubleshooting
ON/OFF
inp u t from
o u tdoor (mode No. 12,
first code No. 1) has b een
set to external protection de v ice
inp u t (second code No.
03) b y remote
controller.
Check the setting state of the
external ON/OFF inp
u t b y
remote controller.
External
protection de v ice
is connected to T1 and T2
of the indoor u nit
terminal.
Replace the indoor u nit control
PCB (A1P).
Acti v ation of external protection
de v ice.
Change the second code No. to
01 or 02 .
YES
NO
NO
YES
Caution
Be s u re to t u rn off the power switch b efore connecting or disconnecting
connectors, or parts may b e damaged.