This is from the owners manual that I have provided a link to, so that you can have a copy for your records. I hope this helps.
Possible Causes Remedies
dial may be at wrong setting. 1. Set ReadyTools
dial to either FLOOR
CLEANING or TOOLS setting.
2. Tank may not be seated properly. 2. Pick up both the 2-in-1 water
tank and formula tank and reseat
them so they fit snugly on the unit.
3. Tank may not be assembled properly. 3. Check to make sure the "lip" of
the nozzle is securely hooked
into the groove on bottom of
Tank (see page 9).
4. Solution or 2-in-1 water tank
is empty. 4. Check fluid levels in heavy duty
bladder and formula tank.
5. 2-in-1 water tank
has picked up 5. Empty 2-in-1 water tank
maximum dirty water and red float heavy duty bladder
door has closed. hot tap water and replace.
6. Red float "door" in the tank may have closed 6. Turn the machine OFF ( O ),
as a result of bumping an object or moving allowing red float door to release into
machine back and forth too quickly. the open position. Turn unit back
ON ( I ) to continue cleaning. Be
sure your forward and backward
strokes are done at a slower pace.