Neither the
owner's manual nor the
quick start guide for this model addresses that specifically, but most commercial microwaves do work this way to ensure proper cooling.
The manual does state that when you open the door then close it, the light and fan will stay on for an unspecified period of time.
If the word "HOT" appears in the display, the magnetron is overheated and the fan will run until the temperature is brought down.
If the fan fan NEVER shuts off, then there may be a stuck relay or defective sensor.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
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