Anti-Icing Control For Indoor Unit - Daikin CTXG09QVJUW Service Manual

Troubleshooting for Outdoor Unit
7.5

Anti-icing Control for Indoor Unit

A5
Error Code
Outdoor Unit LED A
Display
Method of Error During cooling operation, indoor unit icing is detected by checking the temperatures sensed by the
indoor heat exchanger thermistor and room temperature thermistor that are located in a shut-down
Detection
room.
Error Decision
Conditions
Supposed
Causes
166
j i h i i
1 2 3 4
In cooling operation, the both conditions (A) and (B) are met for 5 minutes.
(A) Room temperature – Indoor heat exchanger temperature ≥ 10°C (18°F)
(B) Indoor heat exchanger temperature ≤ –1°C (30.2°F)
If the error repeats, the system is shut down.
Reset condition: 3-minute standby is over and the indoor heat exchanger temperature is above
0°C (32°F)
Wrong wiring or piping
Defective electronic expansion valve
Short-circuited air
Defective indoor heat exchanger thermistor
Defective room temperature thermistor
h
5
SiUS121632EA
Service Diagnosis