The timer is moving and the food is still cold. On the Wolf drawer microwave covered here, demonstration mode can produce that complaint. A very fast countdown is another clue the owner guide associates with demo mode. It does not mean every no-heat failure is a setting.
First check the drawer itself. Wolf says not to operate a microwave with a bent door, damaged hinges or latches, or damaged sealing surfaces. Do not defeat the interlocks. If anything is damaged, stop using it and arrange service. These precautions appear on PDF page 4 of Wolf Drawer Microwave Oven Use & Care.
Check the display without opening the appliance
For an intact drawer, PDF page 14 asks the owner to verify the cooking settings and consider demonstration mode when food does not heat. On the control panel shown in that edition, page 8 gives this exit sequence: touch Settings five times, then Start. The display should say “Demo Off.” Use it only if the panel and manual match your microwave.
Unresponsive touch controls are a separate entry. The guide identifies Control Lock and, on page 7, says to touch Control Lock, then Start to unlock it. “Lock Off” confirms the change. A locked panel and a running microwave that produces no heat are different observations; include which one you have when you call.
If the display is flashing after a power outage, the guide calls for Stop/Clear and resetting the clock. Avoid trying unrelated sequences from another Wolf oven. The M-Series wall oven and the drawer microwave do not share this control guide.
When the setting check does not explain it
Wolf’s MD24/MD30 service manual has a troubleshooting chart for an oven that appears to run with little or no heat. Its component procedures cover the control system and high-voltage heating circuitry. There is no reliable way to select the failed component just from “runs cold.”
Leave the cabinet closed. The service manual’s safety warnings on PDF page 24 address electric shock and the microwave’s internal circuitry. Removing power does not make those service procedures an owner job. Do not pull the built-in drawer out to test wiring or reach an internal fuse.
Arrange a Wolf drawer diagnosis
Tell us the model, whether the countdown looks normal and what the display said after any matching owner check. Request service for a drawer that still will not heat. We provide independent Wolf repair; the $99 diagnostic is credited toward the repair. That visit covers diagnosis of additional units without another diagnostic charge. Repair work is quoted after the cause is established.
Sources: Wolf Drawer Microwave Oven Use & Care, PDF pages 4, 7–8 and 14; MD24 and MD30 Technical Service Manual, part 824820, revision A, December 2013, PDF pages 24–25. These are physical PDF page numbers, including front matter.