What Thermistor can I use to fix Blomberg tl45td type 2e122655?

The element is no longer heating up and I have narrowed down the fault to a thermister. It is in series with a 2.7-2.9 kW element. There is nothing shown on the old thermister to give me any ideas. Would anyone be able to help? Which one do I need and where can I get it from? Thanks :>