Southwark Council said the cooker, which used liquefied petroleum gas, endangered both customers and residents living above Spice N Nice bakery in Camberwell.
Environmental health inspectors who visited the business in July 2024 also discovered a large number of gas canisters stored in the bakery.
Spice N Nice bakery in Camberwell
Dezrene Judith Clarke and Mark Scott, the owners of Spice N Nice, had previously been told to stop using the equipment by the council 18 months earlier.
Ms Clarke, 53, and Mr Scott, 73 from Carshalton, South London pleaded guilty to four breaches of the Health and Safety at Work Act 1974 at Croydon Magistrates’ Court on March 3.
Two charges related to their failure to maintain a gas cooker and prevent fires.
A further two charges concerning employee safety and electricity at work regulations were due to the poor maintenance of the power and lighting circuit at the bakery.
Southwark Council added that it had identified dangerous electrical sockets that could pose a risk to staff and customers.
Ms Clarke was ordered to pay £1,800 in fines for the breaches, a £450 legal surcharge and £1,500 in court fees.
Mr Scott was told to pay £1,200 in fines, a £450 surcharge and £1,500 in court fees. The total amount to pay between them is £6,900.
The case against the bakery at 8A Coldharbour Lane was brought by Southwark Council. Councillor Natasha Ennin, Southwark’s Cabinet Member for Community Safety, said: “This conviction sends a clear message that we will not tolerate businesses that neglect the safety of their employees and customers.
“Ensuring compliance with health and safety regulations is paramount, and we will take decisive action against those who fail in this duty. The safety of our residents is our top priority, and we will continue to enforce the law to protect them.”