What does Aurora inverter error E031 mean?

In the ABB/Power-One product manual for this Aurora inverter family, E031 is an internal error: the inverter has measured voltage at the output relay outside the permitted range. That identifies an inverter-side fault condition, but it does not by itself prove which internal component failed. We confirm the exact model, verify the external AC supply and DC array inputs, follow the proper restart procedure and document whether the code returns before recommending repair or compatible replacement.

Can an older Aurora inverter keep operating with E031?

A persistent E031 condition can prevent normal production because the inverter cannot complete its output-relay checks and connect normally. On equipment that has already operated for many years, a recurring internal fault is a reason to compare manufacturer support, repair feasibility and compatible replacement—not a reason to guess from the code alone.

Was the inverter replaced during this Palos Verdes Estates visit?

No. This video documents the service-call diagnosis, including the paired-inverter comparison, AC and DC checks and controlled restart. Replacement or compatibility work is a separate approved scope.

Do you service older Aurora and Power-One solar inverters?

We evaluate legacy Aurora and Power-One systems, document the installed model and electrical conditions, and develop a repair, manufacturer-support or compatible replacement path based on the actual equipment and array configuration.

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Real Eco Solar & Electric job video proof

Aurora inverter showing an E031 internal error? See this Palos Verdes Estates solar service call.

For this Aurora/ABB inverter family, the manufacturer fault table defines E031 as an internal error: voltage measured at the output relay is outside the permitted range. That points to an inverter-side fault condition, but the code alone does not prove which internal component failed. This Palos Verdes Estates homeowner called Eco Solar & Electric directly after finding us on Google, reading our customer reviews and exploring our website. At her property, two legacy Aurora inverters gave us a direct comparison: one unit was operating while the other displayed E031. We documented the code, verified the AC supply, checked the DC array inputs and performed a controlled restart before defining the next repair or compatible-replacement step.

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How we can help

Common reasons customers call

Direct homeowner inquiry from Google search
Customer reviewed our online reviews and website before calling
Aurora and legacy Power-One inverter troubleshooting
Manufacturer-defined E031 internal-error diagnosis
Output-relay voltage measurement outside the permitted range
Side-by-side comparison of paired inverters
AC disconnect and supply-voltage verification
DC string and array-input checks
Controlled shutdown and restart sequence
Written findings for the homeowner
Repair, manufacturer-support and compatible-replacement planning

Clear process

What happens next

01Review the homeowner's reported production issue
02Identify the exact inverter model and compare the paired units
03Verify AC supply and accessible DC array inputs
04Follow the manufacturer-safe shutdown and restart sequence
05Document whether E031 returns and define the next approved step

Field experience

E031 points inside the inverter—but the recommendation still needs evidence.

This 95-second field video shows the diagnostic sequence at the Palos Verdes Estates property. For this inverter family, E031 indicates that the internal voltage measured at the output relay is outside range. A persistent internal fault on equipment that has operated for many years can support repair-versus-replacement planning, but it does not prove that the relay itself is always the failed component. The video documents the observed condition and service-call testing; it does not claim that inverter replacement was completed during this visit.

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Manufacturer and safety guidance

Requirements and instructions vary by equipment and project. These resources explain the principles behind our recommendations.

Ready when the problem isn’t.

Need service in this area?

Call, text a photo or send a short description. We’ll help identify the right next step.

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