Why does the inverter report a relay self-check fault?

What you will see

• The inverter remains in a checking or waiting state.
• A relay-check warning appears at startup.
• Generation stops and the same warning returns.
• The issue begins after installation, electrical work or a supply disturbance.

Why it happens

Solis identifies relay self-check protection as a distinct alarm category. The message is evidence that a check has not completed successfully; it does not, on its own, establish which component needs replacement.

The manufacturer’s service guidance includes checking the AC connection, supply readings and earthing as part of the investigation. These checks require appropriate instruments and a qualified person; a screenshot cannot establish the condition of internal contacts or external connections.

Give the installer the sequence of events. A fault present from the first commissioning attempt calls for a different review from a fault after months of normal operation. Also note whether other grid warnings appeared immediately before the relay message.

Keep any restart already attempted in the record. Do not repeat it simply because an earlier attempt briefly restored operation. The service decision should follow the exact model’s instructions and the observed fault history.

Diagram

What the inverter does before connecting

1. 01Checks grid readings
2. 02Tests its output relays
3. 03Connects and generates

A relay self-check fault means step 2 did not complete. The technician checks the AC connection, supply readings and earthing.

What you can check yourself

• Photograph the complete alarm and inverter status.
• Record whether it occurs at morning startup, after an outage or during operation.
• Save accessible event-history screenshots without changing settings.
• List recent electrical work, inverter replacements or firmware updates.
• Note whether the property has ordinary grid power while the inverter remains stopped.
• Use existing installation photographs if labels are difficult to reach. There is no need to remove a cover or approach exposed connections to obtain additional information.

What not to do

• Do not disable relay checks, bypass contacts, open the inverter or change grid-protection settings. Do not copy a service procedure from another inverter model.

When to call us

• Arrange service for a persistent or recurring relay-check fault. If it is accompanied by smoke, arcing or a burning smell, keep clear and seek emergency assistance rather than waiting beside the equipment for troubleshooting.

Relay faults in Faisalabad and Lahore

For Faisalabad and Lahore sites, tell our team whether the fault appeared at commissioning or after months of normal running. That changes the review.

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The inverter model, full warning, event timeline, accessible history, recent work, and your city and area.