Tresa Fault E09

Hi,
I'm looking for information on a Tresa control panel. The lift goes out of action at floor level with the fault E09.
If you switch the lift onto maintenance controls the lift will run and once put back onto normal the fault clears.
Does anyone know what the fault code means?

Thanks

Don't know anything about these, but my guess would be a back contact of the safety check. On inspection it does not do safety checks.

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