I have the 436 handheld; even if I have a system # on and it shows on the display; if I go to Review/Edit System on the 436, then push enter, scroll to your system # press enter, there is a menu for Edit Sys Option. Push enter for Edit Sys Option and where it says Set Avoid, make sure that menu is set to stop avoiding. If I have the system # on and that Set Avoid menu is set to Temporary or Permanent Avoid for that system #, even though showing on the display, that system # will not scan.
Rich - N3VMY - KAG0096