Hello, Pat -
You have not stated the manufacturer name of your heating pad. Knowing that will help in providing you the right information.
I have found complaints about a Sunbeam King Size XpressHeat heating pad, with statements from the owners about an F appearing on the temperature display for the heating pad and the pad no longer heating.
In case yours is a Sunbeam King Size XpressHeat heating pad, see the complaints here:
https://www.sunbeam.com/pain-relief/heating-pads/sunbeam-king-size-xpressheat-heating-pad/002013-511-MASTER.html
Scroll down the page to see the Reviews.
I hope you saved the instructions which came with your heating pad and the sales receipt. The pad may still be covered by the manufacturer's warranty. Most companies require a copy of the sales receipt when an owner needs warranty coverage.
You can add more information by choosing Comment and typing in details (maker and model number) for your heating pad.
Best wishes.
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