Cooler switches on no issues, control panel lights up and compressor runs. After a while the compressor becomes hot although the cooler doesn’t chill. There are no fans around the compressor so can rule that out as an issue.
I checked the resistance across the compressor, PTC relay and overload relay and all seemed to check out – overload relay had 2 ohms of resistance so bought a replacement and PTC relay just to be safe.