Fermax 3321 with error p16-33-20032001 - Ring Intercom - Ring Community

I tried to test the fermax 3321 with ring intercom which is compatible but I get error p16-33-20032001 The 3 wires are well connected and tested for connectivity for +, - and L. Don’t know what to do anymore, perhaps the fermax is not really compatible.

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Ring Intercom, problema di comunicazione codice P16-33-20032001 con Urmet 1740/1 e staffa 1740/83 - Citofoni, videocitofoni e intercomunicanti - PLC Forum

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Ring Intercom problem with Urmet 1704/82. Error code P16-33-20032001. Anyone knows how to solve? : r/Ring

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Ring Intercom - Error P16-10-20032001 - Ring Intercom - Ring Community

Ring Intercom, problema di comunicazione codice P16-33-20032001 con Urmet 1740/1 e staffa 1740/83 - Citofoni, videocitofoni e intercomunicanti - PLC Forum