Avanti wine chiller model WC681BG not cooling after replacing cooling fan.

https://manualsdump.com/en/manuals/avanti-wc1500dss/66172/12
The above has a troubleshooting matrix.

Power supply: Check if the wine fridge is receiving power from the mains supply. If it's not, there might be a major issue with the mains power or the PSU circuit board in the product that'll likely need replacing if it's faulty.
Condenser fan: The condenser fan is designed to cool the condenser and condenser coil within the Avanti wine cooler. If it doesn't function, the condenser and coil can overheat - causing the internal area of the wine fridge to heat up too. Take a look at the rear of the unit and make sure the condenser fan is spinning freely and not blocked (by dust / dirt) or making excessive noise due debris or a blockage.
Thermostat: If the Avanti wine fridge thermostat is working correctly, it's responsible for making the condenser, evaporator, fan, and compressor work - so it's super important! The thermostat also allows you to control and adjust the temperature of the wine cooler so if the reading on thermostat is inaccurate (or flat out wrong) the wine cooler temperature will likely be inaccurate too.

Why Is My Avanti Wine Fridge Not Cooling (And How To Fix It) - Expert Wine Storage

This is Thermoelectric Cooler, so no compressor. Clean around the back where the heatsink and fan is.

https://www.manuals.ca/avanti/ewc1201/manual?p=9

Customer Service is on the next page.

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first off determine where the noise is coming from what area? I suspect u may have a fan or condenser fan problem restricted , impeded or going out?

The cost of one of those compressors is over $100. When you factor in tax and labor you're better off junking it. Its also possible you have a compressorless cooler called Peltier.

Do only if you are properly trained on live circuits.. Do at your own risk. Check the compressor's capacitor and the relay. Is the compressor getting juice?

I've added a link for an Avanti ewcb,
http://www.retrevo.com/support/Avanti-EWC16B-Refrigerators-manual/id/867bh235/t/2/. There you can find a complete manual on the product which will help you to locate where the problem is coming from. hope I've helped!

Sorry we do not have any way to recommend where to get it repaired.

it may be as simple as the coils needing cleaned you can buy a can of condeser cleaner at your local hardware store.

I have the same E4 problem. You can order the PCB from Avanti at Miami Florida or your regional Avanti service rep.

Is it cooling ok?Where did you find the oil? If is not cooling and you see an oil spot inside or outside where the compresor is that means there's a refrigerant leak.