Vaillant Boiler's Burnt Circuits and Negligible Customer Support

In September 2020, I purchased a Vaillant VUM 18/24 AS/1-1 (H-TR) Ecotec Intro combi boiler for a total of 5,117 TL, including VAT. Unfortunately, the warranty on my boiler expired in October 2022. On June 17, 2023, during a severe thunderstorm with heavy rain in the 152 Evler neighborhood of Bursa, I believe that a power surge caused significant damage to our boiler. It completely malfunctioned, leaving us in an inoperable state. I contacted my neighbors, and we discovered that their electrical appliances, such as televisions, washing machines, and modems, were also damaged simultaneously. We reached out to Vaillant service on June 18, and a technician visited our home to inspect the device. They determined that the power supply circuit was damaged and needed replacement. However, as the technician was unavailable, a different service representative arrived two days later to replace the power supply card and restore the functionality of the boiler. They issued a technical service report, stating that the damage was caused by an electrical surge from the power grid. I personally witnessed the replacement of the power supply card and found it perplexing that the card had suffered damage despite having W-Automatic fuses and additional glass fuses on the circuit. Furthermore, I have the following complaints against Vaillant regarding the incident: Despite the presence of W-Automatic and glass fuses on the power supply card, it still burnt. If these measures are insufficient, why hasn't the company taken additional precautions for such situations? I had to pay an additional 5,000 TL solely for the replacement of the power supply circuit, even though I had purchased the boiler for 5,000 TL just 2.5 years ago. When I initially purchased the boiler, despite the seller's insistence on recommending alternative brands due to the small size of my home, I specifically chose Vaillant. Vaillant has shown no willingness to reduce costs, offer discounts, or extend the warranty in light of this incident. During the initial installation, I was not clearly informed about the warranty extension. They simply mentioned it in the service records without my knowledge. As a result of this ordeal, I want to state here that I will not choose Vaillant again. There has been no effort to repair the faulty card, and it seems our hard-earned money is of no concern to them. I urge Vaillant to address these issues promptly and provide a satisfactory resolution to regain my trust in their products and services.