There are (I think) three possibilities:
1. There is a fuse inside the unit.
2. The water heating element has a thermal fuse that has failed as a result of overheating (no water in the reservoir at some point)
3. The control panel has failed or the low-voltage power supply that powers the control panel has failed.
My guess would be #2. This is a readily available part (electronic supply stores) but not easy to replace (unit disassembly can be quite challenging). If you're handy, give it a try. The thermal fuse will be wired directly across the terminals of the water heating element. It will have very low resistance (~1 ohm) if it is good.
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