Frigidaire microwave not heating

Try cutting the power to it for 15 minutes to effect a power reset to the mainboard.

It is still does it, you need a service call or a new one. It is a known issue.

https://www.google.com/search?q=Frigidaire+Gallery+microwave.+The+internal+light+and+internal+fan+stays+on

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AUTHORIZED DEALER Frigidaire Gallery Series
FGMV155CTF
30 Inch Over the Range Microwave Convection Option Sensor Cooking SpaceWise® Rack
4.4 Average rating of
73 reviews
color: smudge proof stainless steel
Smudge Proof Black Stainless Steel FGMV155CTD
$569.00 Smudge Proof Stainless Steel FGMV155CTF
$519.00 product highlights
Optional Built-In Trim Kit Convection Sensor Cook quick specs
Dimensions
Width: 29 7/8 Inch
Depth: 15 7/16 Inch
Height: 16 13/32 Inch
Features
Capacity: 1.5 Cu. Ft.
Cooking Watts: 900
View more Frigidaire 4 Piece Kitchen Appliances Package
Get the bundle for just $3,44800View the Bundle Recommended Accessories Available Colors/Finishes Stainless Steel (FGMV155CTF) Black Stainless (FGMV155CTD)
Frigidaire GALLERY™ 1.5 Cu. Ft. 900W Over-the-Range Convection Microwave

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Model No: FGMV155CTF

Features:

• 170/300 CFM 2-Speed Exhaust Fan
• Convection Option & Sensor Cooking
• Express-Select™ Controls
• SpaceWise™ Convection Rack
• Effortless Clean™ Interior

If this is new, return to the place of purchase, causes, defective magnetron, bad inverter board, and possibly keypad control board.

Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101

I have one same model for sale $100

See this file.

We have a similar problem! It sounds like a problem with the microswitch inside the unit that the door is suppose to engage when closed. If not engaged properly, it will not cook. We had the switch replaced last March but it has started acting up again. We can press in on the door and/or lift it slightly and it will cook. Try putting time on the counter and hit start. It the word "cook" appears then try moving the door slightly and see if the turntable starts turning. If not, then you may have a more serious problem. Good luck!

the fan is not working. it is necessary for the fan to run to cool the magnetron tube. do not use till repaired as prolonged lack of cooling will destroy tube

Sounds like the magnatron tube or it's fuse.

The most likely problem is the magnetron. Check your warranty in owners manual, I believe you have five year warranty on magnetron.