Frigidaire freezer displaying F code and hi temp

[Iceburgthagreat]

Manufacturer: Frigidaire

Type of Appliance: Stand up freezer

Model Number: LFFH21F7HWJ

Have you validated the model number at an online parts site like Repair Clinic? (yes or no): Yes

Have you watched the video on how to search for manuals and have you searched the Downloads section prior to posting this request? (yes or no): Yes

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[Terry Carmen]

I don't see "F" documented as any sort of code.

Is the compressor running? Is the fan running? 

It's a pretty simple machine. The controller runs the evaporator fan and compressor when the thermistor indicates that the box isn't cold enough, and there's a heated defrost that runs every 12 hours.

 

[Captain Dunsel]

Extreme or Quick Freeze

Pressing Extreme Freeze or Quick Freeze key turns the compressor on for 72 hours. The Extreme Freeze LED (if so equipped) is illuminated when this function is engaged and the acceptance tone sounds. The display will show “-F-”. The Extreme Freeze key toggles the state On or Off. The user is allowed to change the set temperature while in Extreme Freeze mode. The new set temperature will be used when the Extreme Freeze cycle is complete.

Defrost will function normally during Extreme Freeze. If Extreme Freeze is activated during defrost, the LED and the display will reflect the mode, but the compressor will not come on until after the defrost cycle is completed. Extreme Freeze will not engage if the temperature setting is “OFF”. The freezer will return to the previous temperature setting after the 72 hours.

Page 3-5 in this service manual: