Immergas MAGIS PRO 12 V2 Instructions And Recommendations page 36

System operating with outdoor unit disabled
You can disable the outdoor unit through a prearranged connection.
This status is signalled by the flashing of the symbol "Outdoor unit operation in progress" (8) and the flashing of the anomaly code "194".
In this condition the requests are met by the integration electric resistances (optional).
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