I don't have the service manual for the MG5350, but according to the service manual for the MG5200 the 5C20 error is related to the purge unit and means "Pump roller sensor error".
about canon mg5350.after message b200 i put the head ink in the midle like the instruction the printer unblocked after i dit a simple cleening not deep from the screen .the printer dit all ok and finished.after that i cant power on the led is off and the ink head is blocked right icant moove to do somethnk. i need a help