Like any built-in appliance, the HMB50152UC needs air around it. This 500 Series microwave is made for a 30 inch opening, with 1.6 cubic feet inside and 1,750 watts, a stainless finish, and a trim kit that sets it into the cabinet instead of above a range.
We see the same installation error again and again: a unit pushed into a tight cabinet with no trim kit. The kit is more than decoration. It creates the air gaps the appliance needs to cool itself. Without them the microwave runs hot and can shut itself down protectively during longer cooks.
So when a microwave stops partway through, we check the installation before blaming a part. Thermal cut-outs that respond to restricted cooling look like failures but are really warnings. The other wear point is the door interlock switches, which loosen with frequent use.
No, it also sets the airflow gaps the microwave needs. Without it, the unit runs hot and may switch itself off to protect itself.
Frequently a thermal cut-out reacting to poor cooling. Examine the installation before any part gets replaced.
Check that the trim kit is there and that nothing covers the vents. If the unit feels very hot after a long run, the gaps may be too tight.
Book in about a minute, or call the desk. Same-day windows inside the Loop on most days, next-day across the rest of Houston.