Pro heat carpet cleaner will not pump solution to

The very best thing to do is to fill the dispenser tank with hot water....just plain hot water. Take it outside on concrete, so you can see what you're doing, and operate the cleaner heads. Alternate back and forth. What's happened is that the machine has set with solution residue in it, and it is stopping it up. The hot water will eventually dissolve the goo, and the machine will start working properly. It may take more than one tankful of hot water, but one will probably do the trick. To keep this from happening again, run another tank of hot water after you've finished. I do it on my carpet after shampooing, and it has the added bonus of vleaning the pickup side as well!
Best regards, --W/D-- please feel free to rate this solution....thanx!