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You're a bit unclear on what screws you took apart to 'clean it'. If you took the canister apart, then this Snapguide page How to Clean Dyson DC07 Canister goes through taking the top section thoroughly apart, and has some notes about things needing to line back up properly, which might help in the event that you're not getting things to snap back together right. I took mine apart solo after picking it up cheap at a flea market, and also recall reassembling the top took a little patience.
Hi. I think the problem may be called either vapor lock or cavitation, or it could be called something else, but the solution is to take the wand apart in the center and let the trapped water escape, then putting it back together before re-engaging the lever.
You need to either clean your nozzle assembly or replace it.Cleaning it can be done as follows, you need carb cleaner Q-tip and a tooth pick. First soak the nozzle in carb cleaner, then use the tooth pick to remove any obvious large pieces of what ever just do not damage the front of the nozzle the Q- tip is for cleaning all the exterior surfaces. Now that you have gone this far you need a compressor and an air gun to blow high pressure air backwards and forwards thru the nozzle this should clean it out. On older models they have a screen assembly behind the nozzle if yours does clean it as these corrode while in storage. Put the assembly back together and test nozzles atomize the fuel (fog) not spray, so watch carefully if it sprays fuel you need to replace the nozzle, pay attention to the spray angle and GPH rating printed on the side of the nozzle it is very important when purchasing a new one that you buy the exact same rated nozzle. Good Luck
After tearing things down and inspecting the handle switch, etc., I
found that my problem was detergent. It sets idle for a while or
doesn't get used very much and the detergent dries and actually clogs
the inside of the hose. I cleared it by fully extending the hose,
pressing the button and allowing the clog to clear itself. The built in
heater helped out a lot once the flow started again. I used a can of
compressed air to provide a little blow back to get things moving but
not too much or the pump would be damaged. Remove the tool and hold the
nozzle into an empty cup while depressing the trigger. A warm vinegar
solution clears things out nicely. It's kinda hard for this piece go defective but easy to overlook when wrapping up and storing the unit. Remember, clean water rinse with 1/4 cup white vinegar. There, I fixed it and wasn't even broke!