How to Troubleshoot Gaggia Classic Pro Espresso Shots That Taste Bitter or Sour, and Lack Crema

Learn what to do your Gaggia Classic Pro is producing shots or coffee that tastes bad, bitter, or sour, or  has little to no crema.

My Coffee Tastes Bitter or Sour, and Lacks Crema

Typically, issues with crema or the flavor of the shot do not indicate a malfunction of the machine. Instead, this indicates that an adjustment needs to be made in the brewing process or that different beans need to be used. The following videos review the different variables and offer solutions:

It is important to use fresh beans, typically beans roasted within the past two weeks are best. Light and medium roasts are best for espresso brewing and richer crema. Storing beans properly is also important. More information can be found here.

If the behavior persists after reviewing these factors then the machine may need to be cleaned. Lack of cleaning can cause burned or bitter flavors, or create flow issues which can result in a weak shot.

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