Won't switch to next cycles, what part would I need to buy? Won't stop filling at small load, will fill up all the way? What part do I need to fix this?

Check you timer if it's not advancing. As for as filling up, could be the pressure switch or water valve. If water comes in when unit id off, the water valve. If it does not fill with unit in off position, the pressure switch is bad or the hose to it could have a hole in it or is clogged up