SiUS281811EA Troubleshooting by Error Codes
Part 6 Service Diagnosis 217
4.5 External Protection Device Abnormality (FTQ-TA Only)
Error Code A0-01
Applicable
Models
FTQ-TA
Method of Error
Detection
Detect open or short circuit between external input terminals in indoor unit.
Error Decision
Conditions
When an open circuit occurs between external input terminals.
Supposed
Causes
Activation of external protection device
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
Fuse (F1U) is
blown.
24 VAC
power is supplied to
TH2 and TR2 terminals.
External
protection device
is connected to TB4 and
TB5 of the indoor unit
terminal.
The external
protection device is
opened.
Replace the indoor unit PCB.
Confirm that wiring follows
the wiring diagram and then
supply power to each
terminal.
Activation of external protection
device.
Replace the fuse (F1U).
YES YES
NO NO
NO
NO
YES
YES
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
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