Troubleshooting by Indication on the Remote Controller ESIE09-08A
208 Troubleshooting
3.55 “U2 ” Power Supply Insufficient or Instantaneous Failure
Remote Control
Display
U2
Subcode 20: high/low voltage problem
Subcode 21: converter problem
Applicable Models All indoor units
Method of
Malfunction
Detection
Detection of voltage of main circuit capacitor built in the inverter and power supply voltage.
Malfunction
Decision Conditions
When the abnormal voltage of main circuit capacitor built in the inverter and abnormal power supply
voltage are detected.
Supposed Causes Power supply insufficient
Instantaneous power failure
Defect of indoor inverter PC board [A4P (1ø) or A5P (3ø)]
Converting problem
Troubleshooting Warning: CAPACITOR SHOCK HAZARD. The capacitors (top surfaces) can hold up to 220V. Use
correct precautions when servicing.
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