Daikin RXYQ-TA Series Service Manual page 188

Troubleshooting by Error Code
3.1.2 External Protection Device Abnormality (FXTQ-TA Only)
A0-01
Error Code
Applicable
FXTQ-TA
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.
Conditions
Supposed
Causes
Troubleshooting
175
Actuation of external protection device
Defective indoor unit PCB
Indoor unit fuse blown
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 TB4 and
TB5 of the indoor unit
terminal.
NO
The
YES
external protection
device is opened.
NO
Fuse (F1U)
is blown.
NO
SiUS341615E
YES
Actuation of external protection
device.
YES
Replace the fuse (F1U).
Replace the indoor unit PCB.
Service Diagnosis