Alarm goes off and freezer not cold

Check along the back and sides of the freezer for any vent-like openings that are covered or blocked by packages. There may be a sensor that's not getting air flow as it should. Although most upright freezers are now frost free, there still can be ice buildup in critical areas such as the thermal sensor or the fan. Can you tell if the fan is running?

Even if the compressor has failed, your frozen items will keep the temp down for several days. I suggest you move the frozen goods to a neighbor immediately. Meat or fish in particular quickly becomes unsafe to eat without at least refrigeration.

Red Alarm Indicator Light
Under normal operating conditions, the internal temperature of the freezer will ensure the long-term conservation of the stored food. When such temperature rises above a certain level (-12 °C), the appliance will trigger an acoustic and light alarm. The light alarm is a blink red light (Red Alarm Indicator Light), while the acoustic alarm is an intermittent sound.
You can stop the acoustic alarm by pressing the Acoustic Signal Stop Switch once.

When switching on the freezer for the first time, the Red Alarm Indicator Light will blink until the internal temperature has reached a level required for the safe conservation of frozen food.

Fast Freeze function
If more than 3-4 kg of food is to be frozen:
1. Press the Fast Freeze Switch for 2-3 seconds to activate the fast-freeze function 6-24 hours before placing the fresh food in the freezer, the Yellow Fast Freeze Indicator Light will illuminate. The compressor will now run continuously, to ensure that the fresh food is frozen as quickly as possible.
2. It is possible to deactivate the function at any time by pressing the Fast Freeze Switch for 2-3 seconds.
3. Place the foods in the freezing compartments (indicated with graphics).
4. Once the food is completely frozen (it may take up to 24 hours) you can manually switch off the fastfreeze function by pressing the Fast Freeze Switch for 2- 3 seconds and the Yellow Fast Freeze Indicator light will also go out.
5. Move frozen food from the freezing compartments into the other compartments (storing compartments) to make room for another freezing.

If the Fast Freeze Switch is accidentally left on, the fast-freeze function will be automatically switched off 48 hours later. The Yellow Fast Freeze Indicator light will also go out.

I believe that you all understand. If you intend to freeze larger amount of food then certainly a few hours before some shopping switch on the fast freeze function.

Dado

Red Alarm Indicator Light
Under normal operating conditions, the internal temperature of the freezer will ensure the long-term conservation of the stored food. When such temperature rises above a certain level (-12 °C), the appliance will trigger an acoustic and light alarm. The light alarm is a blink red light (Red Alarm Indicator Light), while the acoustic alarm is an intermittent sound.
You can stop the acoustic alarm by pressing the Acoustic Signal Stop Switch once.

When switching on the freezer for the first time, the Red Alarm Indicator Light will blink until the internal temperature has reached a level required for the safe conservation of frozen food.

Fast Freeze function
If more than 3-4 kg of food is to be frozen:
1. Press the Fast Freeze Switch for 2-3 seconds to activate the fast-freeze function 6-24 hours before placing the fresh food in the freezer, the Yellow Fast Freeze Indicator Light will illuminate. The compressor will now run continuously, to ensure that the fresh food is frozen as quickly as possible.
2. It is possible to deactivate the function at any time by pressing the Fast Freeze Switch for 2-3 seconds.
3. Place the foods in the freezing compartments (indicated with graphics).
4. Once the food is completely frozen (it may take up to 24 hours) you can manually switch off the fastfreeze function by pressing the Fast Freeze Switch for 2- 3 seconds and the Yellow Fast Freeze Indicator light will also go out.
5. Move frozen food from the freezing compartments into the other compartments (storing compartments) to make room for another freezing.

If the Fast Freeze Switch is accidentally left on, the fast-freeze function will be automatically switched off 48 hours later. The Yellow Fast Freeze Indicator light will also go out.

I believe that you all understand. If you intend to freeze larger amount of food then certainly a few hours before some shopping switch on the fast freeze function.

Dado

Unplug it for about 10 minutes to allow any capacitors to dissipate. Switch back on. If alarm starts straight away, suspect faulty controller, probably caused by the spike in the power supply

check the engine and pipes.cooler

THE RED WARNING LIGHT KEEPS COMING ON AND I HAVE TO KEEP PRESSING THE FAST FREEZE BUTTON, THIS IS EVERY FEW DAYS. IF I DONT NOTICE ALL THE FOOD DEFROSTS!

You need to check the temp in the freezer to make sure it's down to around 10 degrees. The alarm will go off much above that.

I called the repair service to send out a technician

That alarm is there for a reason. Grab your owner's manual and see the different things it can mean. If the gas is getting low, that could be it, and you'll want to solve it as early as you can.

Sometimes a power surge or brown out can make that alarm go off. Try unplugging it for 5 minutes.

i've pulled up the service diagram for it and there's no thermostat or temperature control but there's a limit sensor inside the freezer I'm sure that such sensor is failing and when it defrosts, it stays on to long, and the whole 15 min defrost cycles goes on causing the freezer to warm up, delaying the freezing process. I'm almost sure that the limit is going.