I regularly see (and repair) this light and / or fan failure on model
JVM1660SB005 and
most any model of over the range microwave.
The problem is on the controller assembly, which I regularly repair very affordably.
At
my Web site, you can get details, plus I have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.
This light failure often occurs when a bulb goes out and the filament shorts, or when the bulbs are removed or installed without first unplugging the oven from the power line. Either can cause such a failure on the controller.
The lights can can be inoperable or stuck on or stuck in "night light" mode. Sometimes this will similarly affect the fan operation or inside light, too.
For more free DIY and other help & advice, feel free to contact me via my site.
Please include FULL model number*, FCC ID number*, + detailed symptom information. ( * on the tag in cooking cavity or around door frame or control frame or on back)
William E. Miller, AS-EET
http://www.microwavecontrol.com
Microwave Oven Control Panel Repair Nationwide
"Recycling by repairing since 1982"
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