SiUS34-907 Troubleshooting by Indication on the Remote Controller
Troubleshooting 175
3.37 “U2” Power Supply Insufficient or Instantaneous Failure
Remote
Controller
Display
U2
Applicable
Models
RXYMQ36 · 48PVJU
Method of
Malfunction
Detection
Detection of voltage of main circuit capacitor built in the inverter and power supply voltage.
Malfunction
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
Supposed
Causes
Power supply insufficient
Instantaneous power failure
Open phase
Defect of outdoor control PCB
Main circuit wiring defect
Faulty compressor
Faulty fan motor
Faulty connection of signal cable
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