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SiUS342303E Troubleshooting by Error Code
Part 6 Service Diagnosis 250
3.4.2 External Protection Device Abnormality (FXTQ-TA and CXTQ-TA Only)
Applicable
Models FXTQ-TA, CXTQ-TA
Error Code
A0-01
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 (FXTQ-TA) or R and C terminals
(CXTQ-TA) on the indoor unit PCB.
Troubleshooting
F u se (F1U) is
b lown.
24 VAC
power is s u pplied
to TH2 and TR2
terminals (FXTQ-TA) or R
and C terminals
(CXTQ-TA).
External
protection de v ice
is connected to TB4 and
TB5 of the indoor u nit
terminal.
The external
protection de v ice is
opened.
Replace the indoor u nit PCB.
Confirm that wiring follows
the wiring diagram and then
s
u pply power to each
terminal.
Acti v ation of external protection
de v ice.
Replace the f u se (F1U).
YES YES
NO NO
NO
NO
YES
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.