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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.
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.
If the fan is blowing with no heat, it is an indication you have an error code. Check the control board for a blinking light. If you find one, look on the wiring diagram that is pasted on the reverse side of one of the panels for a diagnostic chart. It will give you a starting point where to look for the issue. You can always jump the red and white wires on the thermostat and if the furnace starts, it's a bad thermostat. If not, look to the blinking light.
Yes we had an electric duvet from this company and it stopped working. Was replaced very kindly and no fuss by John Lewis and the same thing happened. (They had said they wouldn't replace again) . Spoke to the company but the woman was very rude. Said that if we lived in a rural area that was our tough luck basically. (A power surge or something). I don't think that's acceptable but we have given up on it now. I think there are 'known' issues with these products that are beingswept under the carpet.