E5
Daikin Overcurrent / Power Supply Protection

Daikin furnace shows E5; unit may not start or may shut down on safety fault.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Shorted component on Daikin control board, Shorted blower motor or inducer motor, Incorrect line voltage, Miswired power connections

How to Fix / Troubleshooting

Safety: Turn off power at the breaker. Do not repeatedly reset a breaker that trips; this indicates a serious fault.

Steps to check:

  • Visual inspection: Inspect the control board, blower motor, and inducer motor for burnt wiring, melted insulation, or obvious shorts to metal.
  • Check wiring tightness: Tighten all line-voltage connections at the Daikin control board, contactors, and junction boxes.
  • Isolate components (technician): A professional can disconnect motors and other loads one at a time to identify which component is causing overcurrent.

Because E5 indicates a potentially dangerous electrical condition, contact a qualified technician to diagnose and replace the faulty component.

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Repair Difficulty

Professional Required 5/5

Required Part

Daikin Furnace Main Control Board or Motor (as diagnosed)
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