Four fire engines and 21 firefighters and officers were called to a fire at a flat above a shop in West Green Road in Tottenham.
Part of a flat on the third floor and part of the roof was damaged by fire. There were no reports of any injuries.
The Brigade was called at 1228 and the fire was under control at 1316. Fire crews from Tottenham, Stoke Newington and Walthamstow fire stations attended the scene.
The cause of the fire has been recorded as accidental and is believed to be due to water getting into the rear electrical system of a fridge freezer.