Multi Plus ODU Main Board Troubleshooting

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Fault Code Fault Description Possible Reason for Fault Potential Fixes
1 Outdoor Ambient Temperature Sensor Fault
  • The outdoor ambient temperature sensor connection is loose
  • The outdoor ambient temperature sensor has failed
  • The sampling circuit has failed
  • Reconnect the outdoor ambient temperature sensor
  • Replace the outdoor ambient temperature sensor
  • Replace the outdoor board
2 Outdoor Coil Temperature Sensor Fault
  • The outdoor coil temperature sensor connection is loose
  • The outdoor coil temperature sensor has failed
  • The sampling circuit has failed
  • Reconnect the outdoor coil temperature sensor
  • Replace the outdoor coil temperature sensor
  • Replace the outdoor board
3 The Unit Over-Current Turn Off Fault
  • Control board current sampling circuit has failed
  • The current is too high because the supply voltage is too low
  • The compressor is blocked
  • Overload in heating mode
  • Overload in cooling mode
  • Replace the control board
  • Replace the compressor
4 EEprom Data Error
  • EE components have failed
  • EE components control circuit failed
  • EE components have been inserted incorrectly
  • Replace the EE components
  • Replace the outdoor control board
  • Reassemble the EE components
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