Viessmann error code

On 12.02.2025, our Viessmann boiler with serial number 7514912401447100 displayed an F5 fault, so we called the service ...center at 444 9092. They informed us that a service request had been created and that we would receive a call. On 13.02.2025, I contacted Çakmak Technical Services at 0212 660 07 7...