Error message 1F on refrig

I have the same model and had the same problem after 3 years of use. I checked this and other sites and here's how I fixed it -- easy, peasy.
1. Turn off the power to the refrig. I have a ckt breaker for the refrig so I didn't have to pull it out of its alcove.
2. Open the bottom freezer section, pull up on the front of the middle drawer and pull it out. If you look to the back inside wall of the freezer you'll see 3 vents.
3. Make a platform that will support a common hair dryer to bring it up to the level of the central vent. I used a couple of packs of napkins topped with a towel.
4. Turn on the hair dryer. I left it on for about an hour and heard two chunks of ice fall free at about the 15 and 30 minute points.
5. Remove the hair dryer and platform, put the middle drawer back in the opposite of how you removed it, and close the freezer section.
6. Turn the power back on.
7. Put a towel on the floor to catch the water from the melting ice chunks.
It's been 24 hours and the error has not reappeared.

If this doesn't work, then other comments suggest that it may be the related circuit panel and you'll need to call in for repairs.

I hope that this helps.