Troubleshooting For Outdoor Unit; Refrigerant Shortage - Daikin 2MXS-N Series 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 output
frequency. If the refrigerant is short, the input current is smaller than the normal value.
Detection
Error Decision The following conditions continue for 7 minutes.
Conditions
24/36 class
Supposed
Causes
136
j h h i i
1 2 3 4
≤
Input current A × output frequency + B
Output frequency > C
A
(–)
18 class 10/1000
27/1000
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
B (A) C (Hz)
0.3 54
2 40
SiUS121502E
Service Diagnosis