Peugeot 107 seat heating failure

I own a 107 as well and had similar symptoms not long ago. Did you check the thermal sensor underneath the seat cushion? In my case, the error was caused by it.

Thanks. Could you give me more details about the thermal sensor? Did its failure completely stop the heating, or just limit it?

The heating was completely disabled. I'd recommend getting it checked out properly at a workshop.

Thanks for the help. A technician diagnosed it as a defective seat heating mat, and the repair cost 390€. Your suggestion helped point them in the right direction.