After techno/obsl.. water heating.. the boiler, the boiler turned off exactly a month later, fortunately there was no frost. It turned out that there was an overhead service. For example, you need to do: charge the battery, clean the contact in the Rihter column, turn off the boiler and get the burner (inspect it for foreign objects). If your partner is still weak in work, do not punish. Just attach it to a more professional employee for at least a month, I also did not immediately start working. Maybe you need more work experience.