How to repair water heater? What are the water heater cable connections? Instantaneous water heater

Greetings to everyone, in this video we will explain why the instantaneous water heater does not work and how to repair it. What are the connection cables, how is the installation done, I will try to explain all the topics as much as I can. I'm trying to explain it as simply as possible so that someone who has never held a control pen can easily understand and do it. My request from you is that it is an electrical product and you need to be extremely careful. If you think you cannot do it, do not get involved in it. Life safety is more important than anything else. If you liked my video, please subscribe, recommend it to your circle, do not forget to like the videos. Thank you for your interest and support in the work done. If you have any suggestions, you can write them in the comments.