I have the 45175A model
2 things to check, first, empty the air out and try running it, mine will not run or start when 1/2 full, too much back pressure, 2, mine will not run at all when cold, needs to be warmed up, we had a room on the job set up for the compressors to keep warm, I thought it was just mine, it was every-bodies. Check it out, Oh and 3, make sure you have enough power, If I can' t get 16 amps, it won't run, just hums, then kliks off. Don't use a cord if you can help it, if you do, make sure it is heavy wire.