The red warning light (exclamation Mark) is on?

Could you please recheck for the model number. R134A is a reference to the coolant used in the freezer mechanism.
Orange is often a reference to the 'Fast Freeze' function being turned On. Green is showing the freezer unit is at the correct temperature. Red is warning the freezer is Too warm. Some freezers are fitted with an 'Economy' function where the freezer can be run at a lower power level when not used regularly such as when on holiday.

It's a freezer. The temperature should be minus 18.C, yours is showing 0'C. It is telling you the freezer is 18' hotter than it should be.
https://www.defy.co.za/amfile/file/download/file/166/product/1996/

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Red light should go out when freezer reaches operating temperature

the flashing maybe door is not sealing check gaskets on door for folds or tears or door not aligned right

it means there is a temperature problem. It is a warning light

It's a temperature warning that the freezer is no longer at the correct temperature. Check all is clean and working, door seal intact etc. If short of gas, probably time to get a new one!!! Bet it won't last 18 years this time though!

This will happen until the temperature gets down to an acceptable temperature.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/jason_4570d45317834dd3

bring to the nearest service center..

red light flashing means temp. is too high (not freezing) just an indicator to let you know that there is a problem
let me know: the freezer temp. (use a temp. reader)
any unusal ice build up on the back freezer panel?
is the freezer fan running?
compressor running?
parital frozen foods?

need to know so i can help you

Look like your refrigerator ran out of freon.