Fire Emergency New Zealand southern communications acting shift manager Ian Littlejohn said at 1.39pm, two fire trucks responded to reports of a burning smell in the police station.
Fire teams investigated and found a hot fuse near a switchboard.
One of the fire crews had a breathing apparatus.
The station was temporarily evacuated.
Firefighters had left the scene by 2.00pm.
Electricians were then called to the site to deal with the problem.