Inverter locked out. Basically, my 8kw inverter decided to stop working properly. It was fine, then grid and domestic connection stopped.

Then it has remained in this state for over a week - generates a little solar, but none useful. My installer refuses to engage, so any clues how to fix this please?

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OK, sorted. Eventually the installer phoned me back. Suggested the carefully hidden and unlabelled box no one had mentioned or documented might contain a circuit breaker. it did, and had tripped. Ha.