It is recommended to schedule a service appointment for your Viking appliances as soon as you notice any issues or require maintenance. Depending on the time of year and the availability of service technicians in your area, it's best to book the appointment at least 1 to 2 weeks in advance. During busy seasons, such as holidays or peak appliance repair times, it may be wise to schedule even earlier to ensure you get a convenient time slot. Promptly addressing appliance problems can prevent further damage and ensure timely repairs, so don't delay in reaching out to Viking's customer support or an authorized service provider to set up an appointment.