If your Gaggia Classic or Gaggia Classic Pro has its power light on, but the machine doesn't warm up, the brew light and steam light never come on, and your pump will not operate, chances are your thermal fuse need to be replaced.
For a detailed look at diagnosing no heat issues and Brewing and Steaming Thermostats check out our article: Not heating, How to Diagnose Replace the Thermal Fuse, Brew and Steam Thermostats
This video covers in detail how to diagnose and replace the thermal fuse, if necessary.
Gaggia Classic Pro: How to Diagnose and Replace Thermal Fuse
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