Are your shots pouring fast, pale, and watery? Low pressure is the usual reason, and it often comes down to the grind, a clogged path, or scale rather than a broken pump.
Here is what causes low pressure and how to build it back up.
This article will teach you:
- What builds espresso pressure
- Why it drops
- What to adjust first
- When a part has failed
Why the Pressure Is Low
- A grind too coarse letting water rush through.
- Too little coffee or a weak tamp.
- Scale restricting the boiler and lines.
- A clogged group head or worn pump.
What You’ll Need
- A grinder and scale
- Descaling solution
- Your owner’s manual
How to Fix Low Espresso Pressure
- Grind finer. Tighten the grind so water meets more resistance.
- Dose and tamp. Use enough coffee and a firm, level tamp.
- Descale. Clear scale from the boiler and lines.
- Clean the group. Backflush and clean the group head and screen.
Pro Tip: Before blaming the machine, adjust your grind. A grind that is even slightly too coarse is the most common cause of weak, low-pressure shots, and it costs nothing to correct.
When to Look a Little Deeper
Because pressure ties to flow and grind, it helps to check related issues, and reviewing a machine that will not pump, shots with no crema, or a pressure gauge reading can pinpoint the cause.
When to Call a Pro
If the grind, dose, and descaling are right but pressure stays low, the pump or a pressure valve is worn. A technician can test the pump before you replace the machine.
Wrapping Up
Low pressure is usually grind or scale. Here’s the recap:
- Grind finer.
- Dose and tamp firmly.
- Descale the machine.
- Clean the group head.
Dial in the grind first, and rich shots usually return. You’ve got this.