I can only speak for a model RF4287HARS (bom RF4287HARS/XAA).
symptom: iceberg forms on bottom of freezer compartment making opening the drawer progressively more difficult.
cause: drain blocked, so defrost water overflows drain pan in freezer instead of flowing to basin underneath.
easy fix that may be enough:
0] open freezer drawer all the way, remove top sliding tray and use a heat gun/hair dryer/spatula to loosen the iceberg and remove it. Bonus points for getting it out in one piece.
1] pull fridge away from wall, unplug fridge from outlet and remove the grill on the bottom/back side of the refrigerator
2] notice two gray tubes in the condenser area in the bottom right (condenser is probably covered in fuzz (vacuum the fuzz off as best you can). The tubes are just a friction fit at the top and bottom, so pull them off and enjoy the waterfall.
3] the top rubber piece on each tube is like a duckbill valve and pulls off the tube. Clean it out and make sure water will flow through it. You want to get the crud off the lips so they don’t stick together.
4] reassemble and see what happens. The hole in the tube should be on the bottom end.
on the RF4287HARS, the defrost heater element dips into the drain hole area and heats the metal drain pan, so although the drain pan probably has a layer of ice in it, you have a decent chance that it’ll melt and drain properly during the defrost cycle. It’s actually a pretty good design.
I had already taken the cover off the evaporator in the back of the freezer compartment so I just heat gunned the metal drain pan and pulled out the ice sheet. If you decide to do the same, it may be possible to remove the two screws holding on the cover and twist the cover out of the way enough to not need to disconnect the wiring.
I unplugged the two connectors, and plugging the connectors back in the was most annoying part of the job.
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