Troubleshooting by Indication on the Remote Controller
SiUS30-1301
216
Service Diagnosis
3.39 Power Supply Insufficient or Instantaneous Failure
Error Code
U2
Applicable
Models
RWEYQ72P, 84P
Method of Error
Detection
Detection of voltage of main circuit capacitor built in the inverter PCB and power supply voltage
Error Decision
Conditions
When the voltage aforementioned is not less than 780V or not more than 320V, or when the
current-limiting voltage does not reach 200V or more or exceeds 740V
For 230V units: When the voltage aforementioned is 190V or less
Supposed
Causes
Power supply insufficient
Instantaneous power failure
Open phase
Defective inverter PCB
Defective condensing unit main PCB
Defective K1, K2
Defective main circuit wiring