It is not seeing pulses back from the sensor at the dish. So you need to figure out why. If the motor is not blocked and you are not at your E/W limit, you have a bad sensor or wiring problem. Most likely a wiring issue.
I am very interested to know the answer to K4EST's previous question... Are you using a shielded cable for the S1/S2 wires?
You still don't know why the same count error has happened on two different controllers.
Something simpler? The ASC1 provides dish movement EXACTLY the same as any DiSEqC 1.2 controller. Move the dish East or West then save the position to a motor assignment number. It programs exactly the same as any G-Box or V-Box controller and moves to a satellite position using exactly the same protocols.
Yes, you have more options available with the ASC1 if you wish to use them (independent fixed LNB power or polarity skew motor control), but these additional settings do not need to be set and can be left at the defaults.
Heck. Another parts replacer. I'd be lost with a naked feeling without my multimeter. Probably would have gotten zapped a few more times through the years. What happens I wonder if the reed switch finally pukes or the cable to it fails? There are not really any more big dish installers out there so self service skills are pretty important. I probably would have been yelled at for saying to take the battery plug out of a AA cell Mag Light and looking for a flash when the actuator control motor was run. The method of doing so anybody with basic skills would immediately identify. But. Parts swappers people will be. Swap me the ASC1 for a UPS shipping ticket that I'll gladly email. I'll need the ticket back but UPS will oblige.
You should try going through the troubleshooting steps and questions/suggestions above, if at all possible, before you give up on that unit. Especially considering one of the guys that laid it out for you knows more about that box than anyone else in the WORLD.
But...if you have moved on from the ASC1 please consider offering it for donation/sale/trade on the Classifieds Board here: