Air enters into the pool when the cleaner is attached and running and stops after the cleaner is removed.
There is either a suction leak that occurs when the cleaner is attached or the pump is cavitating because of inadequate water supply on the suction side of the pump. Refer to the pump section for cavitation solutions
There is excess wear on the bottom of the cleaner, and the “wing hooks” may have broken off the pods.
The “shoes” are worn, and the vacuum in the cleaner hose is probably too high. Use the “vacuum gauge adaptor” or “flow gauge” supplied with the cleaner to measure the vacuum in the cleaner hose. You should have 1" vacuum per section of hose. If you happen to have the new “flow gauge” adjust the flow so the reading is at least ½ way between maximum and minimum.
Check to make ensure that the hose connected to the head is the leader hose (the section of hose with the grey cuff). A connector hose attached at this point can cause this situation.
Check to make sure the leader hose is in good condition. Hold the leader hose by one end. It should fall straight down. If not, replace the hose. Always store the hose in a straight position when removed from the pool.
A 12V light receives its power from a transformer, which steps down 120V to 12 V. 120V is your standard house voltage. Some areas of the country do not allow 120V lights. The brightness is equal for either voltage because brightness is measured by the bulbs wattage.