We did some extensive research and somehow found a service manual for our unit online. According to its section 4-1 "Error Items and Diagnostic Codes" the following is the problem:
(code) FE - (description) Power source frequency error - (Trigger) Invalid power source frequency - (Action taken) Check for: (a) Not using regular power source frequency (b) Invalid power frequency sense circuit.
In other words, either the thing you have plugged your machine into is faulty, the electricity itself is of poor quality where you live, or the sensor within the unit is faulty and giving an erroneous error code.
In our case, we had our machine hooked up to a cheap surge protector; which we thought might be the likely source of our problem in the light of the error code description above. So I tried connecting it to a commercial extension cord (I still got an FE code). So I tried moving the extension cord to another room's circuit, thinking maybe it was localized in the laundry room (I still got an FE code).
So, I am guessing we either have a bad "power frequency sensor" or the problem is due to the terrible electricity we have where we live (i.e. that the power frequency fluctuates too much due to our local power company's poor system).
Regardless, I hope this answer helps somebody with the "FE code" problem, now that you know what the code means.
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