my breville bambino plus espresso is just dripping out super slow or not at all. how do i fix this?

Diagnosis

This issue, commonly known as "choking" the machine, occurs when the resistance created by the coffee puck is greater than the 15 bars of pressure the pump can push through. In the Breville Bambino Plus, this is almost always caused by an over-compressed puck or a physical blockage in the 54mm filter basket. When the water cannot penetrate the coffee, it will either drip slowly through a single "channel" or fail to flow entirely, often resulting in a loud, strained pump sound and a complete lack of extraction.

The root cause is typically a combination of three factors: a grind size that is too fine (approaching powdered sugar), an excessive dose of coffee that leaves no room for water to expand, or "blind" holes in the basket caused by coffee oils and microscopic fines that have baked into the stainless steel mesh. You can confirm this by running a "blank shot" with the single-wall filter basket inserted but without any coffee; if the water flows freely and clear, the machine's internal pump is healthy and the issue lies entirely with your coffee preparation or basket cleanliness.

How to Fix It

Follow these steps in precise order to resolve the flow restriction:

1. Adjust the Grind: If you are using a burr grinder, move the dial one or two notches toward "Coarse." The coffee should feel like fine table salt, not a cohesive paste. If the coffee clumps together in the basket, it is too fine.
2. Calibrate the Dose: Use exactly 18 grams of coffee for the double-shot basket. If you are using the provided scoop, fill it level. After tamping, use the Razor dose trimming tool to shave off any coffee protruding above the rim of the basket. If coffee is touching the shower screen before you even start the brew, the puck will compress too much and choke the machine.
3. Standardize Tamping Pressure: Apply a firm, level press. You do not need to put your entire body weight into the tamp; approximately 15-20kg (30-40 lbs) of pressure is sufficient. The goal is to remove air pockets, not to crush the coffee into a solid brick.
4. Clear the Basket Holes: Remove the filter basket and inspect the bottom. If you see tiny plugs of coffee or a film of oil, use the cleaning needle (located in the tool tray) to poke through every single hole in the bottom of the basket to ensure no physical blockages remain.
5. Perform a Backflush: Insert the single-wall blind filter (the one with no holes) and run a cleaning cycle with a tablet. This clears any coffee oils that may have migrated from the basket into the group head's three-hole shower screen.

If That Didn't Work

• Switch to Dual-Wall Baskets: If you are using pre-ground coffee from a grocery store, it is often ground too inconsistently for the single-wall (non-pressurized) basket. Switch to the dual-wall (pressurized) basket. These have a secondary layer that regulates pressure and is much more forgiving of grind size and tamping errors.
• Check Water Hardness/Scaling: If the flow is slow even with no coffee in the basket, calcium buildup is likely restricting the internal thermojet. Perform a full descaling cycle using a commercial descaling solution or a 50/50 mix of white vinegar and water. Run the solution through the group head and the steam wand.
• Inspect the Shower Screen: Use a screwdriver to remove the metal dispersion screen located under the group head. If it is clogged with old coffee oils, it will restrict flow regardless of your grind. Soak the screen in warm soapy water or replace it if it is severely pitted.
• Verify Bean Freshness: Very fresh beans (roasted within 3-5 days) release a high volume of CO2. This gas can create an air pocket that resists water flow. Let your beans degas for at least a week after the roast date before using them in the Bambino Plus.

Heads Up

• Avoid Over-Tamping: Tamping harder than 20kg does not improve the flavor; it only increases the likelihood of choking the machine and causing the pump to overheat.
• Daily Maintenance: Always purge the steam wand for 1 second after every use and wipe the shower screen with a damp cloth between shots to prevent oil buildup.
• Water Quality: Use filtered water to prevent lime-scale buildup in the thermojet heating element, which is the primary cause of permanent flow reduction in the BES500BSS model.
• Basket Handling: Never scrub the inside of the filter baskets with steel wool, as this can damage the precision holes and lead to uneven extraction (channeling). Use a soft brush and hot water.