Four fire engines and around 25 firefighters tackled a fire at a mixed-use commercial building on Shaftesbury Avenue in Soho.
A small part of the basement of a bar was damaged by fire. There were no reports of any injuries.
The fire is believed to have been accidental and involved a commercial fridge.
A London Fire Brigade spokesperson said: “If your white goods start making a strange noise, don’t ignore it. If you think there’s a problem always unplug it and contact the manufacturer or a qualified repair technician.
"Most fires where white goods are the source of ignition are not down to anything you have done – so always make sure you register your appliances as you’ll be informed if any issues are identified with the product you’ve bought.”
The Brigade was called at 0446 and the fire was under control by 0547. Fire crews from Soho, Euston and Lambeth fire stations attended the scene.