An older unit and a demanding mode do not always mix well. The HMC80151UC, now discontinued, was an 800 Series speed oven for a 30 inch opening. It had a combi microwave constant setting on top of microwave, convection, broil and warm, with 1.6 cu ft inside and 1,920 watts.
Combi constant mixes microwave and convection in a set proportion, which makes it an efficient choice for roasting a small joint. It also loads the magnetron and the convection element at once, so a unit this old that begins behaving inconsistently deserves a hard look at both.
When an owner says it works some days and not others, our first suspect is something small, a door interlock switch that has slipped out of adjustment and causes the unit to start only now and then. High-voltage parts also age in a unit that was used a lot, and they hold a dangerous charge, so this is an appliance we service ourselves.
On a speed oven, an on-and-off start usually comes from a door interlock switch that has drifted out of adjustment. It is a modest part, and a common culprit.
No. A microwave contains a capacitor that can retain a dangerous charge even when unplugged. It is one of the few appliances we say firmly is not a do-it-yourself job.
It cooks with microwave and convection at the same time in a fixed ratio, which suits a small joint, but it loads the magnetron and the convection element together.
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