DAIKIN E417 (PT1), E419 (PT2), E421 (CT1), E423 (CT2)

Alarm Logic:
E417 Voltage sensor (PT1) is not functioning correctly
E419 Voltage sensor (PT2) 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
E419 Alarm display only
E421 Alarm display only
E423 Restart after 3 minutes