Today, I also had problems with my Hamilton changer. My hopper was jammed. I had to dump the coins and then put them all back in. Then everything worked again.
I learned something about my Jim Coleman Company vacuums today. Greg was fixing everything that was broken at my wash when we discussed the timer differences that I had.
Apparently if the timer (1034r timer sn-052200-88) has the new firmware it says "SELECT" and if the firmware is old it says "ADD". Also, you could test by pressing the buttons. If the buttons sound when pressed it is the new firmware. If there is no sound then it is the old firmware. This is important because the old firmware allows fragrance or vacuum and with the new firmware you can switch between the two.