Refrigerant Shortage - Daikin FTX50GV1B Service Manual

SiBE041029EC
4.6

Refrigerant Shortage

U0
Error Code
Method of Error Refrigerant shortage is detected by checking the input current value and the compressor
running frequency. If the refrigerant is short, the input current is lower than the normal value.
Detection
Error Decision The following conditions continue for 7 minutes.
Conditions
<RX50/60G2V1B, 71 class>
RX50/60G2V1B
71 class
<RX50/60G2V1B9, RX50/60G3V1B, RX60G4V1B>
RX50/60G2V1B9
RX50/60G3V1B
RX60G4V1B
Supposed
Causes
Service Diagnosis
≤
Input current A × output frequency + B
Output frequency > C
A
(–)
18/1000
27/1000
Input current × input voltage
Output frequency > F
D
(–)
2000/256
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
B
(A)
0.7
2.0
≤
D × output frequency + E
E (W)
–181
Troubleshooting
C
(Hz)
55
40
F (Hz)
55
62