Can't get lid off of water and shampoo tank of a hoover steam vac

Make sure the dirty water tank lid is seated properly. If that doesn't work, take it to your local vac shop

You probably have a solenoid valve which has failed and will not open. This will require replacement of the valve. For temporary use you can mix a soap solution and put it in the rinse tank. The correct mix is 5 ounces of Hoover shampoo to a gallon of hot water.

There are two electrical solenoids inside the hood assembly. One opens to dispense rinse water, and the other dispenses the soap and water solution. It is likely that the soap and water solenoid has failed and will require replacement. A "work around" fix for this is to mix the soap solution in the clear water tank ( 5 oz. of shampoo per gallon of water ), and shampoo that way until the solenoid can be replaced.

make sure that you have filled everthing properly and the hoover steam is in a good condition. or check else is there any loose coonections in the bottom of the hoover, which makes the tank empty.
if the problem persists take it to service.

You didn't give a model number so I'll tell you both methods. The F5xxx and F6xxx models have a cap at the top of the clean water tank that doubles as a measuring cup. The cap is about 3 inches in diameter. Fill the cap to the fill line with shampoo and dump it in the tank. Then fill the tank with hot (Not Boiling) water.
The F7xxx series has a 2 section tank. The large section is for hot (Not Boiling) water. The smaller section is for shampoo. Fill the smaller section with shampoo and the Steam Vac will mix the water and shampoo for you in the proper proportion.

From your description, you have a problem with your one of the solenoids that may be stuck open. this would require a shop repair.

I’m happy to assist further over the phone at https://www.6ya.com/expert/robert_b96ba3f038cf317c

kindly please wait...

The bottom tank is for the dirty water, the top tank, it has a small tank attached to it for the shampoo, clear hot water goes in the bigger tank. Then turn it on, squeeze the trigger as you pull it backwards. It will spray and vacuum up at about the same time.

This happens when the filter on the inside of the lid for the dirty water tank is pushed all of the way up. You need to leave a 1/4 in. gap from the top to the top of the filter.

Make sure that that the lid for the dirty water tank is locked on to the bucket, the other is make sure that the filter on the inside of the lid is not all the way up, needs to be a gap 1/4 inch or so.