Likely needs freon in system
It is the job of the refrigeration system to move heat from inside the cabinet to the outside - that is why when it works correctly, the compressor runs and the condenser and some of the pipework becomes quite warm (hand hot in some cases).
If this is happening it proves heat is being moved though if the cabinet doesn't become colder it is possible the heat that is being moved could be coming, in a frost free appliance, from the defrost heating element that must be permanently on due to a timer or thermostat fault. The defrost heater usually is switched on only for a short time at the end of each cooling cycle.
If the condenser isn't warm while the compressor is running, it could be the compressor is broken or the refrigerant has leaked away.
Testimonial: "Thank you for your answer. Where do I start? change the compressor or add refrigerant?"
From your question I am guessing you have decided the condenser isn't warm and therefore you don't suspect a fault that is leaving the defrost panel switched on?
A fridge compressor is generally a very reliable bit of equipment which will last a long time if the fridge was properly levelled when it was installed. If it doesn't make strange noises and produce vibrations but can clearly be heard running it can be assumed to be serviceable as a working hypothesis.
That leaves a lack of refrigerant as a likely cause of the problem. The only reason there could be a lack of refrigerant is because there is a leak. Finding and curing the leak, removing any moisture from the system and regassing a fridge with the correct weight of gas is a task to entrust to a specialist - not the least reason is refrigerant gas is powerfully damaging to our atmosphere. In some parts of the world it is ******* not to use a properly licenced specialist.
By leaving this refrigerator in an unheated room all winter and unplugging it be why it may not be working properly now? THANK YOU
It is the nature of many things including household appliances to fail while being unused and much moreso when they aren't new. While they are in use they maintain the same range of temperatures, movement, humidity, etc.
When unused for a period especially in unheated conditions they are subjected to different temperatures and humidity ranges and consequently condensation. Every time the temperature rises things expand and then shrink again when the temperature falls.
This can result in corrosion, electrical and electronic faults, loosened pipe joints, altered plastic parts, reduced lubrication of joints and hinges and other moving parts and all manner of deterioration to all manner of things...
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