Hello Paul Maksymowicz & welcome to FIXYA,
Your
ERROR code SEEMS to indicate you have
indeed filled your SAFETY tray (designed to
prevent FLOODING).
FRIGIDAIRE's solution is to
UNINSTALL
your unit and (
TIP)
drain your dishwasher
to eliminate your "i30"
ALARM condition...
Without intervention the SEWAGE situation
(
I suspect) will reoccur...
FIX IT...!!
To ELIMINATE the DISPOSER flooding condition
(
building codes usually require an elevated
SYPHON BREAK (adequate))... to prevent
back-washing of
WASTE-WATER into your
cleaning unit (serious
health & safety issue).
FOLLOW proper installation procedures...
(
read the manual) and avoid poisoning yourself,
your family, associates, visitors, friends & loved
ones... (my opinion).
https://en.wikipedia.org/wiki/Carnac_the_Magnificent