Whirlpool error code F2 (model ADG8970/1)

Good evening, gentlemen! So, it all is in the subject line: have got an error code F2 when attempting to launch my Whirlpool ADG 8970/1. Since water was in there before the start of washing cycle (it has happened once and was repaired by rinse programme being run), I first checked the pipe that runs water out of the machine: put a vessel below the unscrewed pipe and ran the rinse programme again. Water went out without any visible problems. Right after the programme launch, machine started to beep just like it does after finishing, but instead of 3 beeps, it sounded constantly, until I opened the door and pressed reset. Before doing so, I noticed an error F2 message. Searching the phorum didn’t help. Any suggestions welcome! Appreciate your assistance in advance!