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Side LED flashing slowly

Tesla Powerwall

Tesla Powerwall Side LED flashing slowly

Solar input below 30 V

Severity

Moderate

Safe to continue?

Not recommended

Technician required?

Recommended

Last verified

September 2026

First safe check

Check whether the indication appears only in low light or when the array is shaded.

What does Side LED flashing slowly mean?

A slowly flashing side LED on a Powerwall+ indicates a fault condition associated with solar input voltage below approximately 30 V. It typically appears at dusk, in heavy shading or when the array is isolated.

Which models use this code?

Verified for

  • Tesla Powerwall

Not yet verified for: individual model series. This code is recorded at brand level until a document confirms it per family.

Most likely causes

01

Solar input voltage below threshold

Manufacturer documented

The unit sees less than roughly 30 V from the solar input.

02

Shading or array-side isolation

Possible

Heavy shading or an isolated string reduces input voltage.

Safe checks you can perform

  1. 1

    Note when the indication appears

    Time of day and weather are the key details for an installer.

  2. 2

    Do not access the array

    DC array work is a technician task.

These steps stay outside the enclosure. Never open high-voltage equipment, bypass safety devices or work on live wiring.

When to stop troubleshooting

Stop and contact a qualified technician if the fault returns immediately, the device smells burnt, visible wiring damage exists, the enclosure is hot to the touch, or the manufacturer specifies professional service.

Can a reset clear this fault?

Reset behaviour is not documented for this code. Use only the manufacturer-approved restart sequence described in the device manual, and treat a code that returns immediately as an unresolved fault rather than a reset problem.

Related symptoms

Not charging from solar

Related fault codes

Flashing red logoInverter fault (AFCI, GFCI or RSD)Flashing white logoIdle; entering sleep stateSide LED flashing rapidlyEnabled but lost gateway communicationSolid white logoNormal operation

Sources

  • Tesla Powerwall+ Owner’s Manual

    View
    Manufacturer
    Tesla Powerwall
    Document version
    —
    Section / page
    LED states
    Verified
    September 2026

    A slowly flashing side LED indicates a fault associated with solar input voltage below 30 V.

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Disclaimer

EnergyFaults provides informational troubleshooting guidance. Electrical and high-voltage equipment should only be serviced by qualified professionals where required. Always follow the manufacturer documentation for your exact model.