If this is pre-owned unit that you bought - it may be clogged. If people who had it did not rinse shampoo solution out of the system after using it - shampoo becomes thick and sticky when dry and may clog the tubes. Also it may impair the pump.
Pump may also be defective. It should make a humming noise while in operation. It is hard to hear when vacuum is on so take the Rainbow with water bowl of the white AQM basin, turn on the vacuum while AquaMate is still plugged in, put your hand on the black plastic on the white AquaMater water nontainer and you should feel pump vibrating inside.
If you feel it start with filling up the white tank and bottle with warm water, turn AQM on and try rinsing it. However if water can not get through at all - it will not help.
Then take the handle apart (a bit tricky but be careful ant to break the plastic and you will get it open). See if there are no clogs there. in tubes nor the VALVE
If no clogs fing - you will have to acces the pomp and few short tubes inside this plastic box assembled onto the water tank. to get it open you may have to break off 4 latches that hold top halve to the bottom. You can purchase one HERE
. Make sure that tubes inside are not bent at the sharp angle and obstructing the flow. If you need any tubing - you can find it cheap at Home Depot (have a sample with you so you pick the right diameter).
Clean all tues inside and you possibly will have to take the pump apart to get it cleaned. If it is not working you can buy one HERE
Stil no luck - put EVERYTHING in a plastic bag or several bags and then in a box and ship it to us - we will get it running.