Thermador built the MEMCW301 alongside the MEMC301 and MEMCW271, siblings of one generation: a 30-inch Masterpiece combination oven mixing convection heat with a microwave section. Its documented circuit is 50A, on a four-wire, single-phase supply for 208V or 240V AC, per the installation manual.
Microwave and convection are functionally separate systems here, so a silent microwave beside a baking oven, or the reverse, is a normal failure pattern and no proof of one shared problem. We work out which system a reported sign belongs to before replacing anything.
The checks that follow: magnetron, high-voltage diode and turntable motor on the microwave side; elements and fan on the convection side; then the door seal, hinges and any corrosion at the junction box, which is likely on an appliance of this age.
A 50A circuit. Thermador's installation manual allows a four-wire, single-phase supply at 208V or 240V AC, and lists the same requirement for the MEMC301 and MEMCW271.
The 30-inch one. Its narrower sibling, the MEMCW271, is built the same way for a 27-inch opening, so check the width as well as the nameplate before ordering parts.
Probably not. The two sections fail independently, so a working oven side tells us the trouble is confined to the microwave parts, which we then test one by one.
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