Upon arrival Oven Range unit was working. customer stated it has been taking 2 to 3 hours for flame switch to get hot enough to open valve to heat oven. we have replaced flame switch twice already. checked out unit and found pilot flame blowing around and not making good enough contact with flame switch. checked for flue obstructions or outside air that could be contributing to the issue, found no problems. adjusted flame switch to be closer to tip of flame. customer will have to check in the morning and let us know if it is still having the issue.