Check your filter. If your filter is dirty, most likely your cleaner is not getting the necessary suction to function. Also check the cleaner hoses; if there are any cracked or punctured hoses, replace them. Another area to check would be the skimmer or wall connection. If the connection is not secure an adapter may be needed. If everything has been checked and it still does not seem to be working, bring the head of the cleaner to our store and we will perform a full inspection to determine if there are any broken or missing parts.