Can You Troubleshoot These Common HVAC Problems Like a Pro?Share:FacebookPinterestTwitterMailThe compressor is humming but not starting. What’s the first thing to check?20%Next Correct Incorrect A weak or failed run capacitor can prevent the compressor from starting. The compressor is humming but not starting. What’s the first thing to check? Reversing valve Thermostat batteries Run capacitor Condensate pump 20%
