The CM301 is a legacy 30-inch combination convection/microwave wall oven, documented in Thermador’s own 64-page Care & Use Manual alongside its close sibling the CM302. That manual lays out a genuinely dual-system appliance: a Custom Combination Mode that blends microwave and convection heat, a standalone Microwave Mode, and a full set of convection cooking modes – Bake, Roast, and Broil – each with its own documented technique chart, plus a Convection Roast and Probe Mode built around a meat probe.
Because it’s a true combination unit rather than a convection oven with a microwave bolted on, diagnosing it benefits from the same split used on any Thermador combi oven: microwave-specific signs point to the magnetron and high-voltage section, while convection-specific signs (uneven Bake or Roast results, probe errors in Convection Roast and Probe Mode) point to the fan, elements, or probe circuit instead.
Key Features
- 30-inch built-in combination convection/microwave wall oven
- Custom Combination Mode blends microwave with convection heating
- Separate Microwave Mode, Convection Bake, Convection Roast, and Broil/Convection Broil modes
- Convection Roast and Probe Mode with a meat-probe input
- Documented in the same 64-page Care & Use Manual as the CM302
Most Common Issues on This Model
Custom Combination Mode producing inconsistent results, often a sign of a weakening magnetron rather than a convection problem
Meat probe port or probe itself failing in Convection Roast and Probe Mode
Convection fan motor wear after years of Convection Bake/Roast/Broil use
Door seal wear affecting both microwave containment and convection heat retention
Aging control panel or relay failures typical of this generation's electromechanical controls