Resurrecting this thread for a related issue: I have a Powerlite Home Cinema 6100, and I'm having a similar problem with the CF motor. The filter was getting stuck when passing one of the limit switches - the CF motor gearbox was slipping. So after disassembling the projector to muck around with the gearbox, I got the filter to slide correctly, but now the motor doesn't stop when the filter hits the limit switch. It keeps chugging away until it finally errors out and gives me the two red flashing lights of death. I think it might be a problem with the limit switch not registering the contact, but I'm not sure what to do about it. Any thoughts? I'm considering trying to replace the limit switch or the entire bracket assembly, but not sure about the parts needed.