LG Bottom freezer refrigerator LRFD25850ST

This model has trouble with ice building up behind the freezer doors preventing them from closing all the way. You may need to defrost.

Replace the faulty switch.

i think there is problem with your compressor unit. You need some maintanance or service of your refrigerator at regular period.

It depends on your model. I have a LRFD25850ST which is an older one from circa 2006. It's a side-by-side LG with the lower freezer. You can not turn the door alarm off, and the actual location of the beeper speaker itself seems to be INSIDE the left-side door, which would make it difficult to find to snip a wire. . Here's what I did to disable mine. Yours may not be exactly the same if it's not the same model, but maybe this will be helpful:
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Above each door hinge on top of the fridge (top left, top right) are two plastic covers held on by one screw and a snap tab.
1. On each side, remove the screw, and snap the cover off.
2. The cover has the plunger switch on it that is activated by the door. The switch has a plug-in connector with 4 wires on it.
3. Two of the wires are HEAVY. Two are thin (mine were thin gray wires)
4. Snip either one of the thin gray wires.

That's it. You need to do this on both doors. I did not disable it on the lower rock-out freezer door, and did not look for where the similar switch is, because the freezer door is rarely if ever a problem for us. It's the two main fridge doors that always cause the beeping because it beeps in only 30 seconds which isn't even enough time to put a few groceries away or take out food to make dinner!

One side effect is that the in-door water dispenser will now WORK even when the door is open. I consider that a plus, as shutting off the water dispenser just because somebody opens the opposite door is a royal pain in the....

And of course, you no longer have a door alarm, so if you leave the door open, your food will get warm or spoil. But honestly... people survived for 50 years with fridges that didn't "remind" them to close the door like a child. We don't need this nonsense.

You can switch off the freezer from time to time to let the ice to melt.

Of course the too much accumulation of ice will affect the freezer.

It is call vacation mode, the machine is operating normally.

Yes. Every thing will run and the only time unit will shut off is when it reached auto defrost. Door open will just not let temps reach normal ranges. There is no protection for this.

er-ff is freezer fan error not running,check for ice build up around fan,a know issue.if ice build up a new main board will be needed.or just a bad fan..

Try pressing the cut off button manually while the door is open. It sounds like the switch may be bad.

Sorry but some models cannot shut off the alarms.  The newer models can.