Had the same issue with my weaco cf80B, the second generation of 80L
From memory it was a $500 weaco controller card. I just kept running it on 12v. The danfoss compressor and control gear are bulletproof, but the fancy weaco gear strapped onto it is ordinary and always fails.
It was 4.5 years old at the time, ran for another 6 years on 12 volt only.
Finally that died before I knew much about fridges and I sold it to a repair guy for $150
Sent from me