Troubleshooting
Plug at the main switch (-1S1) connected?
No Connect plug at the main switch
(chap. 8.4, page 79)
Yes
Main switch (-1S1) defective?
Yes Replace main switch
(chap. 8.4, page 79)
No
Power cord with mains plug (-X1) defective?
Yes Replace power cord with mains plug
(chap. 8.2, page 77)
No
Plug of the controller cable connected to the
socket Interface Screen Board of the controller
MB1 I/O-board (-3N2)?
No Connect the plug of the controller cable to
the socket Interface Screen Board of the
controller MB1 I/O-board (chap. 8.8,
page 84)
Yes
Plug of the controller cable connected to the
controller display (-3N1)?
No Connect the plug of the controller cable to
the controller display (chap. 8.9, page 85)
Yes
Temperature fuse (-1F2) is blown because of a
controller error?
Yes Find and remove the cause of overtempera-
ture
Replace temperature fuse
(chap. 7.11, page 74)
No
Controller MB1 I/O-board (-3N2) and/or
controller display (-3N1) defective?
Yes Replace controller MB1 I/O-board
(chap. 8.8.1, page 85)
and/or
controller display (chap. 8.9, page 85)
No
Line filter (-1Z1) defective?
Yes Replace line filter (chap. 8.3, page 78)
20 Service Manual KBF (E5.2) 04-2015