Thermador’s manual treats the CM302 as a close sibling of the CM301 rather than a separate design: each is a legacy convection/microwave wall oven, 30 inches wide, offering Custom Combination Mode, a separate Microwave Mode, charts for Convection Bake, Roast and Broil, and a Convection Roast and Probe Mode that uses a probe. The two share one manual, one model family and one feature set.
That makes our approach the same as for the CM301. Microwave-side signs, such as weak or absent heat, arcing or a turntable that has stopped, are kept apart from convection-side signs, namely uneven baking and probe errors, because the two heating systems fail independently.
Where a nameplate shows something different from the manual, we go with the nameplate. Door seals and control relays complete the visit, and our written price comes first, before any work begins.
Not in any way the manual shows. Thermador documents both in the same 64-page Care & Use Manual with identical features, so we treat them as one design for repairs unless a nameplate says otherwise.
A meat probe properly seated in the documented probe port. If errors appear only in that mode, the probe or its port is the suspect rather than the convection heating system.
It tells us the convection side is healthy and the trouble sits in the microwave parts, usually the magnetron or high-voltage circuit. We confirm with separate tests of each mode.
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