The F84 code is a communication error between the user interface panel of the microwave and the main control board. This could be the result of a problem with the touch panel's interface board, the main control board or the wiring between them. (The wiring harness can come loose or have a bit of corrosion at the connectors.) The usual recommendation is to check the wiring at the interface board then replace the interface board first. If that doesn't solve the problem, you have to replace the control panel.
If you add a comment with the model number of the unit, I may be able to help you find the parts your unit needs.
I hope this helps.
Cindy Wells
I have the same problem, the model number is EW30MC65JS2. Is the interface panel accessible without having to take out the whole unit from the cabinet? Is there a illustration available showing how this board is accessible? Is the main control board also accessible without having to bring out the whole unit? When I start the microwave the fan does come on but the light doesn’t and then the error code comes up in a few seconds, could there potentially be another issue and if so what could it be?
https://www.partselect.com/Models/EW30MC... has several relevant parts diagrams. You need to get to the top and sides of the unit to access the main control board. I hope this helps.
Cindy Wells
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