One washer will not start without several attempts...

One washer will not start without several attempts to "reboot" the machine.
Just this morning, I had trouble with error messages. I loaded my wet articles into the 1st dryer...no problem, but the 2nd dryer (nearest the window) was hell. Constant error messages, & of course the dryer would not start. I kept getting "error 6". Why doesn't Coin-A-Matic post what these error messages mean, & how to correct them. No matter what I did, I could not get the error message cleared. What made the situation even more irritating was the fact that I had just topped up the laundry card.
It shouldn't be the tenants to contact Coin-A-Matic..it should be the superintendent or Melchior. THEY are the ones who contracted to bring these machines into the building. I shall be contacting the Superintendent this morning, & if I'm not offered a new laundry card., WITH the monies that I lost, I shall then contact Management. This is ridiculous. We have 21 apartments in this building, & just 2 washers & 2 dryers.