[Elecraft] K3: "ERR TXF" help with info

[Dave]

Hi-
 On SB the rig works correctly. On FM and AM when I trigger the VOX I get the "ERR TXF" message. 
 I have a K3 with 12, 2.7, 500, 200 filters beginning at slot 1.
CW, Data, AM and SSB modes  are set for "FLTX FL2"; FM is set for "FLTX FL1".
FL1 is set to "ON" for FM; FL2, 3 and 4 are on for other modes.
FL5 is always set to "OFF". FM mode is set to ON.

 I have tried setting the AM filters both to FL5 (OFF) since I don't have the AM filter... that didn't help.
 I have powered the rig off after setting the filter parameters, and I have made sure I am in an allowable band segment for each mode. (That is old thinking, but good!)
 Any ideas?
Thanks for the help.
73 de Dave K1OPQ at arrl.net