We have improved the PCB in the MAC 2000 Profile II, Performance, and Wash as of S/N 4032636001 with a current-limiter circuit for the pan/tilt driver section. The current-limiter protects the PCB from a damaging overload by switching off the driver output for 3 to 4 seconds if the motors draw too much current.

If this happens, you may experience odd, on/off pan or tilt movement. This is a sign that the motors are wearing out and need to be replaced.