The refrigerator is keeping food cold as normal, I think. I don't have a thermometer to check temp inside. The freezer seems to be cold but not cold enough to freeze What should I check? The compressor is an invert one because I went to check the start relay only to find there isn't one. Just a wire harness coming from a cream colored box with a circuit board inside which plugs into the 3 prong compressor connector. Have already done a defrost on the freezer because of ice build up on the back wall of freezer.( 24 hours unplugged) it has been plugged back in for about 18 hours now. Thanks for any help.