[Solved] AKPO PKA 30 830 Induction Hob: Stopped Heating, Display Symbols Flashing, How to Repair?

Hello. :)

Today I used the induction hob as usual (Akpo PKA 30 830). I started to fry and after a while, it stopped heating and two symbols flash on the display
___
| __ __
| alternating with |

After holding your finger on the on / off button for 10 seconds, it beeps twice and then nothing. It does not react to anything else.
On the nameplate:
Akpo
Ceramic hob
PKA 30 830
220-240 V ~ 50/60 Hz
Max power 3000W
Class I
18 32
Does anyone know this problem?
What is it about?
How can it be repaired?

Thank you all in advance for your answers

Check it "In order to disable the keypad lock, press and hold the" + "key for about 2 seconds until
two symbols "[] []" "appear on the display

It only beeped after 10s. holding the ON / OFF button - it was the only reaction and there was no lock on.

In the end, it was enough to turn off the fuses and it works.