This year, my 10-year-old DCS RGU-366 oven stopped working twice. Both times, I was able to defeat it! I feel like an accomplished repairman now, when it comes to ovens.
In Februari, the oven stopped working because it was run with the door slightly ajar. The control panel and knobs heated up so much, that a safety thermostat blew. Once I learned how to dismantle the oven, studied the schematics (glued to the back of the unit) and measure the switches, I was able to identify and then replace the Stalled Fan Thermostat using a cheap replacement from Amazon.
And in September, the oven stopped working again. This time with slightly different symptoms. Again, after two days of dismantling, studying the schematics, and measuring, I was able to determine that the ignitor had failed. This is a $150 part, OEM, but all you have to do is look up the specs for it (Amperage) and find a matching generic ignitor for $40, which works just as well!
In both cases I saved a lot of money on a repairman. But also a lot of money on parts. The OEM parts are priced outrageously. All you need to do is determine what the phsyical characteristics are of the OEM part, and buy a generic part with the same specs. Again, a lot of money saved!
I now feel like an expert on the RGU-366 oven. I understand how they work, and if one stops working, I think I can quickly diagnose it.