Daikin E417 (PT1)~E421 (CT1)~E423 (CT2)

Alarm
Logic		 E417 Voltage sensor (PT1) is not functioning correctly
E421 Current sensor 1 (CT1) is not functioning correctly
E423 Current sensor 2 (CT2) is not functioning correctly
Possible
Causes		 Device malfunction
  • Sensor failure / Controller failure / Broken wire / Connector disconnected / short circuit
Trouble
Shooting
  • Check connector for securing and disconnecting CN1 and CN2 on PT/CT board (EC5)
  • Check PT/CT board. Replace PT/CT board as needed
Controller
Action		 E417 Alarm display only
E421 Alarm display only
E423 Restart after 3 minutes
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