I have a DH504EL. Should the fan run constantly? It hums, so I know the motor is running, but the fan isn't moving>

If the fan is simply humming but not turning over take the back cover off and make sure the blower piece is free turning. i used to have a dehumidifier(goldstar similar model long sold though) it had a bad thermal fuse in the fan motor but compressor worked perfect. bolt is i think 10mm and i had to peel the tape off of the motor windings to get at the fuse. soldered new one in(p/o gave me new fuse and 10 bucks to get it out of his hair what a deal:) ) and retaped the windings. also the felt bearings may be loose but i just lubed the front and back bearing housings well with syn-lube(valvoline for brakes) and reassembled. baby oil works wonders so does vasoline but due to heat that trick does not last long before making a racket and leaves a **** on the assemblies underneath(mess) so try the high temp lube or any moly based brake lube