Fridge side stays cold for about 3 weeks or less and loose temperature, turn off for 1 hour and its back to normal.

The defrost timer normally only cuts in once every 24 hours. It sounds like your thermostat or temperature sensor is defective. The set back temperature should be about 2'C less than the set temperature.

Start lowering down temperature, you may need to defrost fridge overnight.

lower numbers usually are less cold

I would guess it's the fan in the freezer compartment that's bad.

Good Afternoon S Trowell - Thank you for your post! Based on the symptoms you are describing it appears that the thermostat has lost its calibration and is not cycling on or off at the proper temperatures. I would recommend connecting with a professional appliance tech for a clear-cut diagnosis and to proceed further.

3 things
If you have ice on the freezer side.
1. defrost timer not working
2. blower fan failed, if it has one
3. defrost limit switch failed..
i dont think it is #2 but 1 or 3
last but not least your defrost heat coil has failed

your defrost timer is bad. this device is dual purpose, it is a small heater/solenoid that calls for the compressor to turn off so the lines can defrost (usually does it once every 48 hours or so). it looks like a round button clipped to the coil lines in the freezer behind the plastic paneling where the cold air comes out. you need to replace that part, which is actually very inexpensive compared to a new fridge. it will unclip from the coil line and the two or three wires will either disconnect or you may have to cut them and splice on the new ones from the new defrost timer. either way it is a job that will take anyone with basic hand tools less than an hour to do.

remove the back wall leave the unit to run half hour open and see if coil have frost all the way from the top of the coil to the bottom if the coil is full you have adefrost problem could be your timer defrost thermostart or heater

Hello! About 2 weeks ago, the same problem began on my Hamilton Beach water dispenser.
Last week, I called the HB service support, and they told me to do the following reset procedure:

1. Dispense 3 cups from the HOT water side, and also, 3 cups from the COLD water side.
2. Turn BOTH back switches OFF (the ones on the back of the water dispenser).
3. Unplug the dispenser, and LEAVE it unplugged for 24 hours.
4. After 24 hours, turn the back switches ON and plug it in.
5. Leave it on for 4 hours WITHOUT dispensing any water.

...it's been about 12 hours since I've dispensed water again for the first time, and so far, SO GOOD! I'll update if the problems reappear.

did you let the fridge stay in it's new place for 24 hours up right before turning it on?
Try turning it off for at least 24 hours and start it back up again.
If you moved it on its side the compressor oil flows into the lines and must beable to drain back down before using it.
If not you'll seeze the compressor.
not good.