Update: There are no obviously loose wires. The thermostat doesn't do anything when the dial knob is turned. I did some metering and actually found 220V at the compressor terminals. Why? If the thermostat is broke there shouldn't be 220V at the compressor! My next idea was to bypass the thermostat (there are only 2 wires with spade connectors). No result. Would it be an idea to hook up the compressor directly to 220V or isn't that a good idea? Working on that thing is a pain in the a** since everything is near the floor, dirty and cramped (after he refrigerator was pu where it sits now a generous amount of construction debris (mostly mortar) has accumulated in the back of that beast, not really making things easier.
