
instand setzen
to repair
To repair or restore something so that it is once again in good, functional condition.
Die alte Brücke muss dringend instand gesetzt werden.
The old bridge urgently needs to be repaired.
repair / maintain
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to repair
To repair or restore something so that it is once again in good, functional condition.
Die alte Brücke muss dringend instand gesetzt werden.
The old bridge urgently needs to be repaired.

to maintain
To keep something in good condition through regular care and maintenance.
Es kostet viel Geld, ein historisches Gebäude richtig instand zu halten.
It costs a lot of money to properly maintain a historic building.
The word 'instand' is used almost exclusively in the fixed combinations 'instand setzen' (to repair) and 'instand halten' (to maintain). It does not function as an independent adjective.
Die Firma wurde beauftragt, die Heizungsanlage instand zu setzen.
The company was commissioned to repair the heating system.
'Instand setzen' (to repair) describes a one-time action to make something broken functional again. 'Instand halten' (to maintain) describes a regular activity to preserve good condition.
Nach dem Sturm musste das Dach instand gesetzt werden.
After the storm, the roof had to be repaired.
The expressions with 'instand' are typically used for technical devices, buildings, vehicles, or facilities. For example, one speaks of repairing or maintaining a machine, a house, or a road.
Die historischen Maschinen im Museum werden sorgfältig instand gehalten.
The historic machines in the museum are carefully maintained.
The expressions 'instand setzen' (to repair) and 'instand halten' (to maintain) belong to a rather formal or technical style of language. They are often found in contracts, instructions, or official reports.
Laut Mietvertrag ist der Mieter verpflichtet, die Wohnung instand zu halten.
According to the rental agreement, the tenant is required to maintain the apartment.