Major water leaks and burst pipes

Fire and/or smoke inside the property

Gas odor

Carbon monoxide detector alarming

No heat if temperature is < 50 outside

No air conditioning if temperature is > 85 outside

No hot water

No electricity 

Refrigerator is not cooling

Appliance other than refrigerator not working

Slow leak that can be contained

Heating/air conditioning not working when temperatures are moderate

Changing air filters

Changing water filters

Changing burnt out light bulbs

Tightening screws on door nobs and towel racks