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https://www.justanswer.com/small-appliance/nbzog-breville-fast-slow-pro-stopped-heating-power-works.html

The issue is most likely caused by faulty/damaged thermal cutoff/thermal fuse that needs replacing. This is the link where you can order the thermal cutoff https://www.ebay.com/itm/353145091937

The thermal fuse is located inside this line cable (red).

Watch this video on how to access the thermal fuse https://www.youtube.com/watch?v=zh7e140Q1EM. Before replacing, please check the continuity of the fuse. Use multimeter and set it to continuity or resistance checking. If the line is open, replace the fuse.

Parts

References