Pressure will not build beyond 20 PSI
I have a JobSmart® 3/4 HP, 4 Gallon Oil-Free Pancake Air Compressor Model number TAW 1516P that was given to me still in the box and apparently unused. I do not have a manual for it. It does not build pressure beyond 20 PSI. The safety valve does not leak and the drain valve is closed. Since the unit is encased (and I don't have a manual), I have not taken it apart to check anything further. I don't see any other posts about this particular model so am hoping someone can help.