Not sure whether to trust the pressure gauge on your espresso machine? A gauge that reads high, low, or sits stuck can send you chasing the wrong fix, so it helps to know how to read it and confirm it is accurate.
Here is how the pressure gauge works and how to handle a bad reading.
This article will teach you:
- What the gauge measures
- Why it reads wrong
- How to confirm the reading
- When the gauge has failed
Why the Gauge Reads Wrong
- Reading idle pressure instead of brew pressure.
- A stuck needle from age or vibration.
- Scale affecting the sensing line.
- A failed gauge that no longer moves correctly.
What You’ll Need
- A blind basket for testing
- Descaling solution
- Your owner’s manual
How to Check the Pressure Gauge
- Read it while brewing. The meaningful number appears during a shot, not at idle.
- Test with a blind basket. Run against a blind basket to see peak pressure.
- Descale. Clear scale that can affect the reading.
- Compare to the shot. If your shots taste right but the gauge looks off, the gauge is likely faulty.
Pro Tip: Trust the taste and flow of your shot over the gauge. A gauge is a helpful reference, but a needle that disagrees with a shot that pulls and tastes well usually means the gauge itself is off.
When to Look a Little Deeper
Because pressure ties to the whole brew, it helps to check related issues, and reviewing low pressure, shots with no crema, or a portafilter leak can reveal the real cause.
When to Call a Pro
A gauge is largely cosmetic on many machines. If it is stuck but shots are fine, you can keep brewing; if you want it accurate, a technician can replace the gauge.
Wrapping Up
Read the gauge during the shot, not at rest. Here’s the recap:
- Watch pressure while brewing.
- Test peak pressure with a blind basket.
- Descale the machine.
- Trust the shot if the gauge disagrees.
Read it correctly first, and you will know if the gauge is truly faulty. You’ve got this.