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Symptom: the display stays dark, the unit never reaches operation, or it faults the moment it powers up.
For trained/authorized installers only. Any restart follows the official sequence, and any cover-off work follows Isolation & Shutdown — including the 5-minute discharge wait.

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Check first

  1. Was the power sequence right? Both platforms power ON AC-first (grid breaker before PV DC before battery). A battery-first habit from other brands stalls boots here.
  2. Is grid actually present at the inverter’s AC terminals? Meter it — upstream MCB, loose termination or a dead phase kills the boot before any menu exists.
  3. What exactly does the display say? Note the precise message/code before touching anything — it decides the branch below.
The one-restart rule. For a fault message: power off in the correct order, wait 5 minutes, restart once. If the same fault returns, collect the evidence and escalate — repeated power-cycling destroys the diagnostic trail and fixes nothing.

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Escalate when

  • Any internal-fault code survives the one restart.
  • The display stays dark with verified AC at the terminals — do not open covers; that is service territory.
  • A boot fault follows physical damage, water entry or a burnt smell — isolate and stand down per Battery Safety if packs are involved.