Troubleshooting-Gaggia-Classic-Wand-Leak

If the wand is leaking from the end of the wand it means the steam valve is not fully closed.
1. Try tightening the knob down firmly. Pressure from the boiler will leak through the wand if the steam valve is not securely closed.
2. If it feels like the knob is spinning in place then the knob may be broken. Try removing the knob and manually turning the steam valve closed. An adjustable wrench or a pair of pliers can help with this. If this stops the leak then the steam knob will need to be replaced.
3. Descale the machine according to the instructions in the Cleaning & Maintenance section of this article. Scale buildup inside of the steam valve will prevent the valve from closing fully and can cause permanent damage to the valve. After the machine has been descaled run 4-6 tanks of water through the wand using the machine's hot water function to ensure any debris or scale in the valve is fully removed.
4. If the leaking persists then the steam valve will need to be replaced. Instructions for replacing the steam valve can be found in the video below

How to Replace the Steam Valve

If the wand is leaking from where it connects to the machine then the wand is not sealing properly to the steam valve assembly.
1. Make sure the wand is securely screwed in. At the top of the wand is a hex shaped stainless steel threaded fitting which screws into a corresponding brass fitting that is part of the steam valve assembly. Use an open ended wrench or adjustable wrench to make sure these two parts are firmly screwed together.
2. If tightening the wand onto the steam valve assembly does not resolve the leaking issue then the o-ring that goes between these parts may be dirty, damaged, or out of place. Unscrew the assemblies and inspect the o-ring. Clean the o-ring off, reseat it around the threaded end of the wand, and screw the wand back into the machine. If the leaking persists this o-ring will need to be replaced.