Last updated: September 18, 2026
A leaking espresso machine is usually dealing with a worn seal, a loose connection, a misaligned water tank, scale buildup, or water spilled during filling. The right fix depends on where the water appears: underneath the machine, around the tank, at the portafilter, from the steam wand, or inside the drip tray.
Before troubleshooting, switch the machine off, unplug it, and let hot water and steam cool completely. If you guess at the cause, overtighten a fitting, or keep using a machine with water near electrical components, you can turn a small maintenance issue into a damaged pump, short circuit, burn, or expensive service call. The process below is suitable for many home espresso machines, including common Breville-style designs, but always follow your model’s manual for disassembly limits.
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What You Need
| Item | Why | Optional? |
|---|---|---|
| Clean microfiber cloths | Wipe water and trace the leak without scratching the finish | No |
| Flashlight | Inspect the underside, tank valve, hoses, and connections | No |
| Shallow tray or towel | Catch water while moving the machine and protect the counter | No |
| Warm water and mild dish soap | Clean the tank, drip tray, basket, and removable seals | No |
| Soft nylon brush or old toothbrush | Remove coffee oils and mineral deposits without damaging seals | No |
| Replacement water filter | Helps reduce mineral buildup in compatible machines; a Geesta 6-Pack Resin Water Filters for Breville BWF100 is listed at about $9.99 | Yes |
| Water tank access funnel | Reduces spills when filling a recessed tank; the Coffee Machine Water Tank Access Funnel for Breville ESP-resso Machine is listed at about $10.99 | Yes |
| Replacement O-ring or gasket | Restores a seal that is cracked, flattened, loose, or swollen | Yes, if inspection finds damage |
Do not use metal picks, abrasive pads, household petroleum jelly, or compressed air on water valves and seals. If a part must be replaced, match the exact model and part number rather than relying only on appearance.
Step-by-Step
See also: How to Replace Espresso Machine Water Filter (2026): Step-by-Step • How to Adjust Espresso Machine Brew Temperature (2026): Step-by-Step
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Unplug the machine and empty it (5–10 minutes)
Turn the machine off, unplug it, and wait until the boiler, group head, portafilter, and steam wand are cool. Remove the water tank, drip tray, portafilter, and any water filter. Empty each component over a sink.
Open the steam valve briefly only after the machine has cooled, and stop if you hear pressure or see hot water. Never remove a pressurized component or open the housing while the machine is hot. Move the appliance onto a dry towel so water cannot reach the outlet or power cord.
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Find the exact source of the leak (10–15 minutes)
Dry the machine completely. Reinstall only the water tank, fill it halfway, and wait several minutes without turning the machine on. Look with a flashlight around the tank valve, tank seam, bottom of the reservoir, and the area underneath the appliance.
If no water appears, place the drip tray and portafilter back in position and run a brief water cycle while watching from the side. Water from the group head may indicate a portafilter seal or a loose basket. Water from the steam wand may mean the steam valve is not closing. Water underneath during pumping points more strongly to an internal hose, fitting, pump, or boiler connection.
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Check the water tank and valve (10 minutes)
Remove the tank and inspect its bottom valve. Press the valve gently over a sink; it should move smoothly and stop water flow when released. A valve that sticks, remains wet, or drips continuously may have debris or a damaged spring and seal.
Wash the tank with warm water and mild dish soap, then rinse thoroughly. Check for hairline cracks around the corners, handle, and valve opening. Do not glue a cracked tank: adhesive can fail in water, shed into the machine, or prevent the tank from seating correctly. Replace a damaged reservoir.
Reinstall the tank firmly and evenly. It should sit flat without rocking. If filling a recessed tank causes repeated spills, an access funnel can help direct water into the opening, but it will not repair a cracked reservoir or leaking valve.
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Clean the drip tray, group head, and portafilter seal (15–20 minutes)
A full drip tray can look like a machine leak. Empty and wash it, then clean the tray rails and the area beneath the tray. Coffee residue around the group head can also prevent the portafilter from sealing.
Remove the basket and scrub the basket holes and portafilter spouts with a soft nylon brush. Wipe the group-head screen and the rubber gasket around it. If the gasket is visibly cracked, flattened, loose, or hard, replace it with the correct model-specific part. A gasket that leaks only when brewing often needs replacement rather than more tightening.
When reinstalling the portafilter, lock it into its normal position without forcing it beyond the point specified by the manual. Excessive force can distort the gasket and damage the handle.
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Inspect accessible hoses and connections (10 minutes)
With the machine unplugged and cool, inspect only areas the manufacturer identifies as user-accessible. Look for a loose clamp, a kinked tube, mineral crust, or a hose that has pulled away from a fitting. Photograph the original routing before touching anything.
If a connection is visibly loose and the manual permits adjustment, reseat it gently. Do not remove the outer housing to reach a boiler, pump, or electrical connection unless you are qualified to service appliances. A water leak inside a powered machine is a reason to stop using it, not a reason to continue testing it repeatedly.
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Descale and replace the water filter when appropriate (20–40 minutes)
Mineral deposits can prevent valves from closing and restrict water flow, which may redirect water through a weak seal. If your machine’s manual calls for descaling, use the recommended descaling solution and follow its dilution and rinse instructions. Do not substitute vinegar unless the manufacturer specifically allows it; vinegar can leave odor and may affect certain seals.
Replace the water filter on the schedule specified for your model and water hardness. A compatible resin filter, such as a six-pack listed around $9.99, may help reduce future scale but cannot fix an existing crack or worn O-ring. Confirm compatibility with your exact machine before buying.
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Run a controlled leak test (10–15 minutes)
Reassemble the clean, dry parts and fill the reservoir to no more than the maximum line. Keep the machine on a dry towel, plug it in, and run a short water cycle while watching the tank, group head, steam wand, drip tray, and counter.
Test one function at a time: brewing, hot water, and steam. Stop immediately if water runs from the underside, a burning smell appears, the circuit breaker trips, or the pump sounds unusually loud. Wipe the area dry and check again after five minutes. A machine that remains dry through several short cycles is likely ready for normal use.
Mistakes to Avoid
- Testing while the machine is wet: Water near the plug, outlet, or controls creates an electrical hazard.
- Overfilling the reservoir: Stay below the maximum line and seat the tank squarely.
- Overtightening the portafilter: A damaged group gasket can leak more, not less.
- Using the wrong descaler: Follow the manufacturer’s instructions and rinse thoroughly.
- Forcing stuck valves: A cracked plastic valve or tank can create a larger leak.
- Ignoring a full drip tray: Empty it regularly so overflow is not mistaken for a plumbing failure.
- Opening the housing casually: Internal boilers, pumps, capacitors, and wiring can remain hazardous even when unplugged.
How Often
Inspect the tank, valve, and drip tray weekly if you use the machine daily. Clean the basket, portafilter, and group-head area after each use. Empty the drip tray before it reaches the float or maximum indicator. Descale according to the manual and your water hardness; many homes need it every one to three months, while filtered, soft water may require less frequent treatment.
Replace the water filter on the manufacturer’s schedule, commonly every few months, rather than waiting for a leak. Check all seals during routine cleaning and replace them when they become hard, flattened, cracked, or unable to seal without excessive force.
When to Call a Pro or Replace
Call an appliance technician if water comes from the base, the leak returns after cleaning, a hose or boiler fitting is inaccessible, the machine trips a breaker, or you see corrosion near wiring. Service is also appropriate when the pump runs but produces little water, steam pressure is abnormal, or the leak appears only after the machine heats.
Replacement may make more sense when the machine has several failures, a cracked tank is difficult to source, the pump and seals need simultaneous work, or the repair estimate approaches roughly half the cost of a comparable new machine. A professional can identify whether the problem is a simple gasket or a more expensive boiler, pump, or control-board failure.
FAQ
Why is my espresso machine leaking from underneath?
Common causes include a loose internal hose, failed pump or boiler seal, cracked water tank, or water overflowing from the drip tray. Dry the machine, identify whether it leaks while idle or only while brewing, and avoid continued use if water reaches the base.
Can I use espresso machine sealant to stop a leak?
Do not apply generic silicone, glue, or plumbing sealant inside the water path. These products may not tolerate heat, pressure, or contact with drinking water. Replace the correct gasket, O-ring, tank, or hose instead.
Why does water leak around the portafilter?
The basket may be clogged or overfilled, the portafilter may not be locked correctly, or the group-head gasket may be worn. Clean the basket and gasket first. If water still escapes around the rim, install the correct replacement gasket.
Is a little water in the drip tray normal?
Yes. Espresso machines commonly release rinse water, pressure-relief water, and condensation into the drip tray. It is not normal for the tray to overflow quickly, fill while the machine is idle, or collect water from the underside of the appliance.
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