Ice maker is not making ice, the arm that indicates if the chest is full won't go down, it is stuck in the up position

Most arms on ice makers are metal.
You might have to take the food out of the freezer temporarily and put the food in an ice chest and disconnect the refrigerator and let it unfreeze the plastic arm.

Did you check to be sure that the arm wasn't raised to the off (FULL) position? Ice makers can be turned off by manually lifting the sensor arm up and latching it in the full position. To release, simply press down gently on the arm and it will return to normal position and ice making should resume. If you already knew this feature, I am not trying to make you feel silly, but there are some that would not be aware of this.

Connie; give it a try, nothing to loose

Check if the unit has a cold water dispenser that it will fill a cup. If so than problem is with Ice Maker. If not than problem is with water supply to unit.
If water to machine works make sure that the arm on the ice maker is in the down position. If it is up it will disable the ice making unit. Cycle the am a few times to insure that the switch connected to the arm has not gotten stuck in the off position.

On some ice makers there is a separate switch to disable the Ice maker usually right on the ice-maker not easily missed.

It is possible that the water feed tube into the Ice Maker has become frozen where it enters into the back of the freezer at the top. You can look through to see where the water fills into the cube tray. If ice is present it would be an indication that the feed tube has become frozen If suspected the safest way to fix would be to turn off the unit and allow for a manual defrost.

Next check the operation of the ice maker. Locate the arm in the up position prohibiting the ice maker from cycling. Wait three hours or more. Open freezer door and return the arm into the down position. After a few minutes you should observe the ice fingers rotating to release the cubes into the tray. If the fingers do not rotate I would suspect the ice maker or the connecting electrical circuit. Remember after dropping the arm the Ice Maker has to warm up to melt the ice cubes from the tray before the fingers are told to rotate,

If the fingers rotate then I would expect that the water supply solenoid has failed inside of the unit near to the location the the water supply is made. Replacing this part needs to be done by a qualified experienced technician.

unplug the unit and check if the icemaker timer is working alright. replace with a new one if it is messed up. thanks .

There is a screw sticking out from the right side of the freezer wall that has a grey plastic spacer around it that acts as a stopper for the ice level arm. I have seen the ice level arm get stuck on top of this stopper before somehow. you just have to carefully bend the level arm around it and move it below the grey plastic stopper. If it is not stuck above that but the arm still will not come down, then the only other solution is likely a new icemaker, as the arm is geared internally to the icemaker to rise and fall as the ice is made.

Is the arm that gets pushed up by the ice cubes (in order to stop making ice when it is full) in the down position? it is able to be pushed up and locked so that the icemaker doesn't make at ice and may need to be pushed down.

its the ice maker .water or condensation has built up in the ice maker modual and refroze upon turning unit back on.either get a new ice maker or uninstall the ice maker and let it dry for a few days and reinstall.but it could happen again that way.or maybe not.

You should be able to move it gently to the lower position.  If it doesn't want to move don't force it.  Try shutting the ice maker off in case the arm is frozen in the up position.  After the ice maker defrosts a bit try again to move the arm gently.

replace the icemaker is the best solution , or possibly jst the control module