SM 74 SPK 000F error

SM 74 is showing error 15 with SPK 000F or SPK 0000 which sometimes goes away and comes back after a few minutes (whilst running or when stationery).

Kindly assist

 

Error 15 is a general malfunction from main electric cabinet. SPK 000F is SAK low battery. This error doesn't stop the machine and it's only a warning. But you need to check DYN tests for error 15. Send some photos from the error.

 

Spk 000F:
maybe there is a bad synchronization of rek with sak, you have to change the battery if its voltage becomes less than <3v

 

Good day,
Thank you team for valuable input.
I have noted that the error 15 was also indicating SEK on the main control panel. Thid led me to do a through look on the safety/guard switches.
The problem guard switch is the inductive sensor switch at the small perfector door. The door was not properly closing.
Problem rectified,
Many thanks

 

Bon travail