Troubleshooting For Outdoor Unit; Refrigerant Shortage - Daikin CTXG09QVJUW Service Manual

Troubleshooting for Outdoor Unit

7. Troubleshooting for Outdoor Unit

7.1

Refrigerant Shortage

U0
Error Code
Outdoor Unit LED A
Display
Method of Error Refrigerant shortage is detected by checking the input current value and the compressor running
frequency. If there is insufficient refrigerant, the input current tends to be lower than the normal
Detection
value.
Error Decision The following conditions continue for 7 minutes.
Conditions
Supposed
Causes
160
j h h i i
1 2 3 4
≤
Input current A × output frequency + B
Output frequency > C
A B (A)
(–)
27/1000 2
If the error repeats, the system is shut down.
Reset condition: Continuous run for about 60 minutes without any other error
Disconnection of the discharge pipe thermistor, indoor or outdoor heat exchanger thermistor,
room or outdoor temperature thermistor
Closed stop valve
Refrigerant shortage (refrigerant leakage)
Poor compression performance of compressor
Defective electronic expansion valve
h
5
C (Hz)
40
SiUS121632EA
Service Diagnosis