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E0

E0 - External protection device activated (Outdoor Unit)

Daikin · Simple Self Diagnosis by Malfunction Code | Daikin

What does E0 mean?

An external device has tripped a safety protection, causing the outdoor unit to shut down.

Common Causes

  • Issue with an external electrical protection device (e.g., breaker)
  • Faulty wiring between the unit and external device

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check your home's circuit breaker panel for any tripped breakers related to the HVAC system.

  2. 2

    Reset any tripped breakers.

  3. 3

    If a breaker trips again immediately, do not reset it and call an electrician or HVAC technician.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

6-06-0 - External protection device activated (Heat reclaim ventilator)6-16-1 - Malfunction of PCB (Heat reclaim ventilator)6-26-2 - Ozone density abnormal (Heat reclaim ventilator)
Source: Simple Self Diagnosis by Malfunction Code | Daikin
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