It has to be repaired. 

Can you please repair it? (formal)

The light doesn't work.

The light is working again.

The heater is not working.

The heater is working again.

Der Wasserhahn tropft.

The faucet is dripping.

The water doesn't drain.

Der Abfluss ist verstopft.

The drain is clogged.

The washing machine is broken.

The window doesn't close.

The internet connection is not working.