A Perth mother has suffered second-degree burns to her chest, arms and stomach after a popular kitchen appliance unexpectedly burst open while she was preparing dinner.

Danika Jones said she was cooking a pasta sauce in her Thermomix in January when the lid flew open and splattered burning hot liquid all over her upper body.

"I had popped the pasta sauce ingredients in the Thermomix using the same recipe I've used every week since I bought the machine more than two years ago," she said.

"Towards the end of the process, it was pureeing the sauce when it started making a funny noise and vibrating.