Why does my u-line 2175rfb show er message on display

SOURCE: LG Refrigerator Defrost Error ER DH

it the def t-stat, def. thermistor, or def. fuse whatever lg decides to call it this week that is causing your issue

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SOURCE: control panel shows "Er dH"

The “er dh” code means a problem with the defrost cycle. It is triggered when the defrost sensor does not reach 46 degrees F within 2 hours of the defrost cycle starting. If indeed the defroster is not working, the evaporator (in the bottom of the fridge in the freezer compartment and behind a plastic cover) will eventually ice up completely, blocking the flow of cold air to the upper compartment. Use a thermometer to check the upper compartment to verify that no or little cool air is reaching it.  If the evaporator is iced up, the defrost cycle is not working. Quick fix to restore operation to the upper compartment: tape over all vent holes in the upper section to keep that cool while you work below. There are about 6-7 vent opens in the back wall and two large one on the floor of upper compartment. Remove freezer door, drawers, slide rails and pull back the plastic cover (2 screws hold it in place, one in the center and one behind the ice maker) at the rear of the freezer section to expose the evaporator. Spray hot water on the ice accumulation on the evaporator (it looks like a radiator) to melt it (remembering to sop up what flows to the drain pan at the rear). The entire operation can be done in about 30 minutes (most time is used for removing ice and sopping up water from the drain pan). All should be ok for 3-4 days depending on humidity before the evaporator ices up again.  In the meantime, order a replacement control board. You can view this by removing a panel w/ 3 screws at the rear left of the refrigerator. This panel controls all refrigerator functions, including defrost. Most likely, the integrated relay for the defrost cycle failed. Swapping out panels is a 10 minute job. Panels cost about $116 incl shipping from repairclinc.com. Shipping is about a week.  You can find a free service manual on line that will help to identify all parts and is particularly useful for removing doors and trays so you can get at the evaporator.  All in all, the customer service is useless. The fridge however is very easy to work on and amazingly simple. The replacement board has a slightly different relay for the defrost heater, so LG may have realized a problem existed with the original. It is also possible that electrical surges damaged the relay.  In any case, 10 minutes and $116 seems pretty minor to have the fridge back to new condition. Good luck.

SOURCE: Fridge doesnt work, freezer works

You need to change the freezer fan motor. FF means problem with the Freezer Fan.

SOURCE: LG LRFD25850ST gives ER CO code on door

Good call Cooltech! My new LG "open box" deal from Best Buy must have been delivered once before. I hauled it home, plugged it in and Er CO was on the display. The doors must have been removed to get through tight spaces, exposing the bundle of wires and connectors under the left hinge cover. One wire had been repaired with a crimp lug, wire cut too short, and the crimp was no good. I soldered the connection and added 2" of wire so it wouldn't be stressed. Works!

SOURCE: H20 dispenser displays er lf

This is an error code for the icemaker fan motor.
If the control does not see a signal coming back from the fan motor you will get this error code.
Please see the image below from the service manual that explains the ER IF error code.

http://media.fotki.com/1_p,wkbwtkdqbqkgrkkxgtqsskgwtqkq,vi/ktfgsrbbdxktrrwffdr/1/1303472/5961857/image18067img-or.jpg

The ER IF code indicates a failure of the icing fan.

You may notice slower ice production but the other fans should be okay.

You can select the ultra ice option and see if the fan toggles on.

The fan or the control is bad.

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