Daikin R71FUV1 Service Manual page 355

Si20-701_B
Remote Controller Display
U0
Applicable Models
RZ(Y)
Method of Error Detection
Refrigerant shortage is detected based on the discharge
pipe temperature.
Error Decision Conditions
Micro-computer judges and detects whether refrigerant
shortage occurs or not.
∗ The system does not decide to error and repeats retry.
Press the check button to indication "U0"
Supposed Causes
Refrigerant shortage
Clogged refrigerant piping system (∗1)
Troubleshooting
Caution
Is the
amount of
refrigerant
appropriate?
YES
Note:
∗1. Check point:
1. Refrigerant filter clogging
2. Electronic expansion valve operation
3. Check valve operation
4. Defective thermistor
348
Troubleshooting by Remote Controller
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
may be damaged.
NO
Charge correct
amount of
refrigerant.
Check clogging
of refrigerant
piping system. (∗ 1)