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You may need to turn on the second control and set it to 0 at night. If you still are having a problem with the heat being uneven, you might need a replacement mattress pad. I know we've replaced several electric blankets or mattress pads due to problems with the control/uneven heat.
The first link has some info about the F2 code.Apparently it used to be seen as FF but was changed.It is a power problem.It is still the same problem,which is REALLY not good.The next couple of links are forums which people also have the same problem as you.I would seriously get rid of that blanket.I saw someone mention EMF.I know exactly what EMF is and it is not an issue with this blanket at all,and is present in many things.A microwave probably has more,and still is not an issue.Anything that plugs into a wall has some form of EMF present,so do not even worry about it.
I have the same numbers on my blanket, mine has a PAC-215 controller, I found a couple of them on ebay. Don't know it all blankets have the controller so check the numbers on the back of your controller.
I got mine for Christmas (2010)... Worked fine the first week or two... Then I noticed that it doesn't get hot at all anymore... Thought maybe my husbands side controlled both (like a master safety)... Since he sets it at 3... Mine is set on 'high'... But no, put his on high, it gets super hot, my side barely warm.
My electric blanket had the same message and I could not find anywhere to answer question. Sunbeam said to look on th cord tag and this was no help. I finally pulled out the main wire box inside blanket and took apart to see if there was anything obvious. All solders looked fine but then I noticed a drop of water. Used a hair dryer to dry the electronic board, reassembled and it worked. Must have been a water short.
I am trying something now as I was told F2 requires you to check the blanket for wear and tear and plug it back in. 3 times doing this should be sufficient. If it still reads F2 it's "gone" Ours is new so it shouldn't be "gone" but here's what I found...Where the plug goes into the blanket there are 4 holes for 4 silver pins. I noticed the 3rd pin was a bit lower than the other 3. It will not move up with pliers so don't force it just return it. check there
My new blanket works great. Then I changed my sheets and would get the F2 problem. Very consistent after 5 tries with F2 blinking by unplugging at wall outlet and comes on with F2 blinking. Let it rest a night and still the same.
Then I unplug it at the blanket. Hmm, notice a pin was lower than the others. PUSH BACK IN FIRM and tried again. Perfect.