Cant remove top to get to the tanks - iRobot 5900 Scooba Robotic Wet/Dry Vacuum

There could be a number of problems, one that the collection tank is not aligned properly. 2. Removable nozzle installed improperly. 3.Removable nozzle full of debris. 4 Red lint screen under collection tank clogged.
5.The collection tank is full. The answer to the first one is: Check tank alignment and secure with side latches. The answer to the second one is Unplug unit. Align two "hooks" into bottom first, then snap into place on top. The answer for third one is:Unplug unit. Remove nozzle and rinse under running water. The solution for 4. is:Remove debris from lint screen. And the solution for 5. is Empty tank

Looks like you have a bagless vacuum. The other kind have a tank. The tank can usually be removed by pressing a lever or switch somewhere on the top area of the tank.
When you get the tank off, it will come apart easily. Try to remove the top of the tank. Then you can dump it out into the trash. Watch how you open and removed the tank so you can put it back together again.

Hopr this helps.

You may want to check to see if the removable nozzle is correctly placed into its place. This is the plastic part where the water is sucked up through by the carpet cleaner. The nozzle notches must fit into the groove on the cleaner correctly and the metal bar need to snap back on top of the removable nozzle, Also sometimes if you have hair trapped in the nozzle or the bristle, it will affect the suction power of getting up the dirty water. The dirty water tank need to snap in place by making sure the top of the gray snaps on each side is over the top groove of the dirty tank on each side and the the gray snaps are pushed down and pushed into the tank to until it is snapped in place.
Super Simple answer could be: The Dirty water tank could have bubbles in it causing it not to **** too.

First check the motor duct gasket. The motor duct gasket is visible once the tank is removed. It is located underneath the handle on the top of the base of the machine. It has a black rubber coating around it. If there is no suction there please let us know. If your machine does have suction at the duct, continue to check the following:

- Ensure the Ready Tools Dial is set to the appropriate setting (Floor Cleaning or Hose Attachments).
- Remove the tank from the machine and ensure the tank lid is attached properly. The front window must first hook onto the lip of the bottom of the tank and then drape over the tank. Latch the bottom tank to the top tank lid. THIS LID CANNOT BE ATTACHED PROPERLY IF THE TANK IS NOT REMOVED FROM THE MACHINE.
- Make sure the Water Tank is not full on the outside of the bladder. If it is, empty the tank.
- Ensure the hose is firmly attached to the back of the machine. If not, re-insert as necessary by twisting into place.
- The machine must be in an upright, locked position and set to the Hose Attachment setting. If the handle is slightly tilted back while using, it will create a small gap at the suction inlet (where handle meets gasket, above the Bottom Tank) which will cause little or no suction.
- Check the red Tank Lint Screen for debris. If the Lint Screen is dirty, the unit will have poor suction. Clean the Lint Screen if necessary.
- If the float flap door in the tank lid is activating prematurely when you turn the machine on, this flap door should be replaced. This tank may need to be emptied.
- Check the Tank Lid and Tank for damage.

Please let me know the model number from the data plate.
It is likely started with the letter "H", followed by at least for numbers.
It will allow me to post the User Manual to you.

Suggest that you do the following.
Remove the TOP ("Clean water") tank. Fill it 1/2 full of water. Put the top on the clean water tank and place it back on the machine.

Release the machine handle and remove the cover of the "dirty" water tank. Inspect the back of the tank to be sure that the vacuum adapter in located in the rear of the dirty water tank. If not-that is your problem. If yes, restore the top to the dirty water tank.

Power the machine on.
On a kitchen floor, power the machine on. Pull the trigger and hold it for about 30 seconds. You should see water gathering around the brushes. If not, that is a problem.

With water around the brushes, release and lower the handle and and move the machine over the water. It should vacuum the water into the dirty water tank.
Is all of that happening?

Possible Causes Remedies

ReadyTools Dial may be at the wrong setting for the cleaning job <> Set ReadyTools <> Dial to either Tools / PreTreat or Floor Cleaning.

Nozzle Window may not be properly attached. <> Press down firmly on the black oval gasket at the top
Window to make sure the two tabs on the back of the Nozzle Window are snapped into the mating slots in the main housing.

Tank-in-Tank lid is not installed <> Re-install lid;

Tank lint filter is blocked <> remove all lint and debris from Tank lint screen.

Tank-in-Tank is not properly seated. <> Tank-In-Tank must be firmly seated to function; remove
and reseat Tank-in-Tank.

Poor tool position (Hand held attachments only). <> Adjust angle; apply more downward pressure.

Tank-in-Tank has picked up maximum dirty water <> Empty Tank-in-Tank

Front Clear Floor Nozzle Window ids blocked <> Remove window and clean all fibres and debris then replace.

Insufficient suction <> Clean Pre and Post Motor Filters.

The black base that the bottle sits in is broke. You can use hot glue to replace the bottle. I would suggest buying a new tank from hoover because the style of tank you have has a known design flaw. They have redesigned the tank to be stronger. You could trying calling the Hoover company and complaining. I know that has worked in the past.

In front at the bottom thiers is a peice mine is square pull it up and out, now take the top of the tank lid off. now slide your upholstery attachment in that place where you pulled out the sqare. the open end facing up, now put the tank lid back on every thing should work .your welcome ttsgma01