I moved my freezer to the shed 6 months ago as soon as the cold weather hits the freezer has stopped working. The light is on inside and out, defrost timer is working. I?m thinking thermostat or compressor

try cleaning drain hole for the freezer always manually defrost at the first sign of ice forming shows drain blocked..........

It sounds like the evaporator fan is hitting ice that is built up on the evaporator coil. When it's making the noise, open the freezer door and see if it stops.
(Most models are wired so that the evaporator fan cuts off when the freezer door is open.)
Check the inside back, lower panel of the freezer for ice built up or frost on it. If there is, you have a defrost problem that is most likley a bad heater. It's located around the coil inside the freezer behind the panel you will be looking at. The defrost problem would explain the freezer not freezing ice cream.

Probably excessive ice in the condensor. Likely defrost thermostat or defrost heater problem.

What happens is excessive ice keeps airflow from the refrigerator part of the unit.

your ref. has a defrost problem.you will need to take back panel off inside freezer and take your hair dryer again and defrost the system.then you can check your heater,thermostat which is located at top of coils that were defrosted.sometimes the thermostat will pop and not allow it to go into defrost and you need to check defrost timer.

Modern fridge/freezers are built to automatically defrost themselves. To do this they require that the room temperature is well above freezing to allow the defrost to take place. If you site the freezer in too cold an environment it is unable to defrost itself and will eventually stop working. It sounds strange but if it is too cold the freezer cannot work. The solution is to buy and fridge/freezer that does not automatically defrost itself if you want it to work in a cold environment.

Refrigeration units don't care for the most part how cold it gets with exceptions. The oil is not a concern, neither is manual or auto defrost. Refrigeration units that are required to operate in cold temperatures, say below 30 degrees F. have crankcase heaters on them to heat the oil which keeps freon moving out of the oil and the bottom of the compressor. Otherwise when the compressor starts the cold freon will we sucked out of the bottom of the compress with a large quantity of oil which can destroy the compressor. Another item used for cold weather application is a fan control sensor which keeps the condensing temperature up or the unit will again remove the oil from the crankcase. It may work fine for a quite a while, but it will fail in continuously cold temperatures.

My husband left the freezer door open a couple of months ago, causing ice to form. The loud rattling noise was the fan hitting the ice. The reason why the temperature started to rise but the noise stopped was because the fan had got stuck in a block of ice and was no longer working. Simple solution - defrost the freezer for 24 hours. Touch wood, it is all working fine now!

My problem also is that freezer is cold but fridge gets warm. When I turn the whole thing off for a sort time it works again.
How would I know which part needs to be replaced to repair this?
Rod
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If the frost build up is on the back panel of the freezer then it has a defrost problem which causes a no cool situation. Let me know more about this frost buildup and what you have done.

Do you know if the compressor in the back is running? If you can check that out get back to me and we can go from there. Most times if the fan in the freezer is running the defrost timer is ok.