Breville Bambino Plus Leaking Water? 5 Fixes (BES500)

Why This Model Leaks More Than You'd Expect

The Bambino Plus has a design quirk worth knowing before you assume something's broken: its drip tray has no rubber seal, and the pressure release pipe vents hard enough to splash water back over the tray's edges. Add the auto steam wand's self-clean spraying into that same tray, and the machine can pool water underneath even when nothing's actually malfunctioning — which is good news, since most of these leaks have a cheap fix.

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Quick Checks (2 Minutes)

• Dry the machine and counter completely, pull one shot, and watch closely where water first appears
• Push the drip tray in firmly — it has two positions, and only the second one fully seats it
• Reseat the water tank, pressing down until it clicks and locks
• Run the auto steam wand once and watch whether water sprays past the tray during its self-clean cycle

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Fix 1: Add a Splash Guard Behind the Pressure Release Pipe (Works 34% of Time)

Symptoms:

• Water appears under or behind the machine, especially right after pulling a shot
• Leak seems to track with brewing, not with idle time
• Drip tray is properly seated and not the source

How to Fix:

1. Unplug the machine and locate the pressure release pipe on the underside, near the back of the group head area
2. Pick up a length of self-adhesive EPDM rubber strip (about 30 cm of 3 mm thick strip, roughly $1.50-3 at a hardware store)
3. Cut a small section, around 50 mm, enough to cover the splash zone behind the pipe
4. Clean and dry the surface where you'll apply it
5. Press the strip firmly in place directly behind the pressure release pipe outlet
6. Reassemble, plug back in, and run a test shot while watching the tray

Time: 15 minutes Cost: $2-4 for the strip Success Rate: 34% Difficulty: Easy

Pro tip: This isn't an official Breville repair, just a workaround the Bambino Plus community has landed on for a genuine design gap — it blocks the splash-back path directly.

If this doesn't work: Move to Fix 2 — the drip tray itself may not be fully locked.

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Fix 2: Fully Seat the Drip Tray — Locked vs. Really-Locked

Symptoms:

• Water pools directly under the front of the machine
• Leak is inconsistent, worse some days than others
• Tray feels like it's "in" but wiggles slightly when nudged

How to Fix:

1. Remove the drip tray completely and empty it
2. Slide it back in and push until you feel the first stop — this is only partially seated
3. Push again, firmly, past that first resistance point until it clicks fully home
4. Gently try to wiggle the tray side to side — it shouldn't move at all once truly locked
5. Run a shot and check underneath

Time: 2 minutes Cost: Free Success Rate: 21% Difficulty: Easy

If this doesn't work: Check Fix 3 — the water tank seal is the next likely spot.

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Fix 3: Replace the Water Tank Silicone Seal (Works 18% of Time)

Symptoms:

• Leak happens even when the machine is idle, not just during brewing
• Puddle forms behind or beside the machine near the tank
• Tank feels slightly loose when reinserted

How to Fix:

1. Remove the water tank and inspect the silicone seal at its base for flattening or cracking
2. Wipe the seal and machine-side dock clean of mineral buildup
3. If the seal looks intact but loose, reinsert the tank firmly until it clicks
4. If it's visibly damaged, replace it — the float switch and seal are usually the failure point on an older unit

Time: 10 minutes Cost: Free (cleaning) or $10-20 (tank/seal replacement) Success Rate: 18% Difficulty: Easy

If this doesn't work: Move to Fix 4 to check the group head gasket.

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Fix 4: Check the Group Head Gasket (Smaller Than the Barista Express)

Symptoms:

• Water sprays or seeps from around the portafilter during extraction
• Machine is a year or more old with regular daily use
• Portafilter locks further than it used to

How to Fix:

1. Remove the portafilter and check the rubber gasket ring inside the group head for hardening or cracking
2. If it's just dirty, soak it in hot water for 10 minutes and reinstall
3. If worn, order a replacement sized for the Bambino/Bambino Plus specifically — it's smaller than the Barista Express's 54mm gasket
4. Press the new gasket in firmly around its full circumference and reinstall the portafilter

Time: 10-15 minutes Cost: Free (cleaning) or $6-10 (gasket) Success Rate: 17% Difficulty: Easy

If this doesn't work: Try Fix 5 — the auto steam wand's self-clean cycle may be the real source.

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Fix 5: Auto Steam Wand Self-Clean Overspray (Works 10% of Time)

If the leak shows up specifically after steaming milk, the culprit is likely the auto steam wand's self-clean cycle, which sprays a burst of water into the drip tray to purge the line — hard enough on the Bambino Plus to splash over the tray's rim near the thermal sensor. Confirm this by steaming milk and watching closely as the machine self-cleans right after; if water appears at that exact moment, this is your source. The Fix 1 splash-guard usually helps here too, since it addresses the same design gap from a different trigger. If the wand also seems to spray erratically or steam inconsistently, see our Bambino Plus auto steam not working guide — a stuck solenoid can cause both at once.

Time: 10 minutes to diagnose Cost: Free Success Rate: 10% Difficulty: Easy

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When DIY Won't Work

Contact Breville support (1-866-273-8455) if:

• All five fixes are exhausted and water still appears
• The machine is under its 2-year warranty and the leak started without any obvious cause
• You notice an electrical smell, unusual noise, or the machine trips a breaker
• The leak is coming from inside the housing rather than the tray, tank, or group head area

Repair vs. replace: The Bambino Plus retails for $499-549. A repair under $50 covers everything above short of a full tank replacement, and is almost always worth it. Past the warranty window with a persistent leak, weigh professional diagnosis against the cost of a new unit.

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Prevention Tips

• Apply the splash-guard strip from Fix 1 proactively, even before you notice a leak — it's a known design gap, not a symptom of something going wrong
• Push the drip tray in until you feel it click fully home every time you empty it
• Descale every 2-3 months to keep the water tank seal and pressure release pipe free of mineral buildup
• Don't overtighten the portafilter — firm is enough, excess force wears the group head gasket faster
• Dry the counter and drip tray area weekly so you catch a real leak early instead of mistaking routine splash-back for a new problem

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FAQ

Is it normal for the Bambino Plus to leak a little?

Some splash-back into the drip tray area is a known design characteristic of this model, not a defect. A genuine leak — water pooling on the counter or dripping steadily — is different and worth working through the fixes above.

Does the Bambino (non-Plus) have the same leaking issue?

The base Bambino shares a similar drip tray design, but without the auto steam wand's self-clean cycle, it has one less trigger for splash-back specifically. The pressure-release-pipe splash issue can still occur on either model.

Will the EPDM strip fix void my warranty?

It's a cosmetic, external addition that doesn't require opening the machine, so it shouldn't affect warranty coverage. If you're within warranty and uncomfortable applying it yourself, Breville support can advise directly.

My Bambino Plus is brand new and already leaking. Should I return it?

If it's leaking heavily on first use rather than the mild splash-back described above, that's more likely a defect than the known design quirk — contact Breville support before troubleshooting further, since a new-unit issue is typically covered outright.

How do I know if it's the group head gasket versus the drip tray design?

Watch the timing: a gasket leak shows up during extraction, right around the portafilter. Drip-tray splash-back shows up after the shot finishes or during the steam wand's self-clean, and pools more toward the front or back of the tray rather than directly under the portafilter.

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Related Breville Fixes

• Breville Leaking Water? 5 Fixes (All Models) — for other Breville espresso machines
• Breville Bambino Plus Auto Steam Not Working? 5 Fixes — if steaming itself is inconsistent alongside the leak
• Breville Bambino Plus Descaling Guide — routine maintenance that helps prevent seal-related leaks