Si20-701_B Troubleshooting by Remote Controller
348
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
îš„ Refrigerant shortage
 Clogged refrigerant piping system (∗1)
Troubleshooting
Note:
∗1. Check point:
1.Refrigerant filter clogging
2.Electronic expansion valve operation
3.Check valve operation
4. Defective thermistor
Is the
amount of
refrigerant
appropriate?
NO
YES
Charge correct
amount of
refrigerant.
Check clogging
of refrigerant
piping system. (∗ 1)
Caution
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
may be damaged.
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