Product review (1 stars): Thermador 30in P304CS
My ProHarmony was 7 years old when I got rid of it. The range cooked well and functioned adequately for the first three years (with the exception of failure of the blue indicator lights) but experienced escalating problems from then on. In the fourth year the air switch, simmer spark, and one of the computer boards failed. About $700 in cost. During the fifth year the oven wouldn't stay on, the air switch failure reoccurred, and the broiler stopped working. My notes for year 5 and 6 included: three or four attempts needed to light oven, rear right burner stopped sparking again, surface light doesn't work, blue lights blink all the time, signal box replaced.  Overall there were about 15 service calls, some at no charge because a repair, by a certified repair person, had to be repeated. In year 6 the oven failed just before a holiday. In year 7 the oven stopped working again, just before Christmas. The repair estimate to fix it was $800 for the mother board and another $100 for a second board. I bought a new range, made in the USA, the next day.