Panasonic MINAS A6 Multi Series Technical Reference page 223

7.5About the protection function setting for homing return by using the Z phase
 Protective function
Error No.
Protective function
Main Sub
94 3 Home position return
error2
7-39
Causes
 When Pr7.22 bit7 = 1 and Pr5.04 = 0 or 1
(Pr5.04 is ignored under pp mode), POT
or NOT has become ON while return
operation to detected Z phase position at
homing with Z phase.
 The return amount to the detected Z
phase position became abnormal in Home
position return which used Z phase.
Measures
 Expand the distance between Z phase
and POT or NOT.
 After confirming the safety, it's made bit7
of Pr7.22 (Communication function
extended setup 1) =0(Invalid).