External Protection Device Abnormality (Ftq-Ta Only) - Daikin SkyAir RZR-TA Series Service Manual

SiUS281811EA
4.5

External Protection Device Abnormality (FTQ-TA Only)

A0-01
Error Code
Applicable FTQ-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
 Activation of external protection device
Causes  Defective indoor unit PCB
 Indoor unit fuse blown
 24 VAC power is not supplied to TH2 and TR2 terminals on the indoor unit PCB.
Troubleshooting
Part 6 Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
External
protection device
YES
is connected to TB4 and
TB5 of the indoor unit
terminal.
NO
The external
YES
protection device is
opened.
NO
YES
Fuse (F1U) is
blown.
NO
24 VAC
YES
power is supplied to
TH2 and TR2 terminals.
NO
Troubleshooting by Error Codes
Activation of external protection
device.
Replace the fuse (F1U).
Replace the indoor unit PCB.
Confirm that wiring follows
the wiring diagram and then
supply power to each
terminal.
217