Pump has worked fine but suddenly suction is gone. Motor still running, just very little suction.

Have you got suction just before the motor? How about air coming out the exhaust?

if this is a inground try only the main drain if it works something is in the skimmer line

i have the same problem and none of these solutions help. they are all for if suction works but brush doesn't. that isn't what she is saying. brush motor works fine. It's the Suction motor that never kicks on. Mine is doing it now and I would love a fix for it. Resetting suction motor. Not brush....

I don't know the answer to this ... your pool service company can advise you. To my way of thinking, you are asking a lot of a 3/4 horse. I have a 1 1/2 horse lifting water in a two inch pipe about 4 feet to my water feature with no reservoir.

Since you have a two inch pipe, why not run a bigger motor? I have two HP on all my filtered lines which are 2" suction and 2" discharge.

Are you absolutely sure you have suction? ... and no air leaks on the suction side?

check the suction hose where it bends down to the floor unit,, lots of times dirt,hair and stuff collects there when the filter was plugged up. remove the floor plate ( like you were going to change the belt ) and use a wire coat hanger to run up the suction hose and back out and clean out any debris, also check the entire hose for blockage ( top to bottom ). if this is all clear and you still have little suction - then the problem could be the vacume motor itself and you will need to take the unit into the repair shop and have the motor rebuilt or replaced.

c..

Be sure the upper attachment hose is inserted firmly into the lower hose into the nozzle. Check for suction at the end of the hose, and if there is no suction there must be an obstruction in the hose, or the filter inside the bag compartment is plugged. Be sure the brush is turning when the handle is released.

Larger debris is usually the responsibility of the brushes. Remove the bin and run the Roomba-- are the brushes actually turning? If not, call customer support for a new cleaning head module. If so, remove the grill from the back of the bin. Make sure that the little fan inside is clean, then reinstall the bin on the Roomba and run it. If that little fan doesn't spin, your Roomba has lost vacuum suction and you need a new bin.

That can be a pain to get to. Lay on the ground in front of the right front headlight. Shine a flashlight through the black vent and you'll see the little black cylinder that is the pump. Unhook the electrical wiring and pull it off. Mine was gunked up with sludge, so after I cleaned out the suction, I replaced it and it worked fine.

The way to tell if it still works is try activating the windshield washers. If you hear the little pump buzzing, it works, but it's not getting a suction. If no noise, you need to buy a new one at Auto Zone.

If the cogs on the belt and brush roll are ok, then probably the cogs on the pulley are worn off, or the pump isn't turning, is the flat belt ok? If all of this is ok, then replace the pump, part # 2107181If no suction, is the black oblong gasket on the top of the clear window. It seals the gap between the tank and the window, no suction if it is gone. Also should be a red plastic screen on the edge of the tank lid, it may be clogged.