Gaggia Classic Pro Boiler Thermostat 107°C – M4, 421940202911

Gaggia 107°C boiler water temperature thermostat, part number 421940202911, with M4 mounting. This coffee temperature switch is listed for selected Gaggia Classic and Classic Pro machines, plus Carrera and Evolution models. Verify the original part and your machine version before ordering.

Specifications

• Part number: 421940202911
• Component: boiler water / coffee temperature thermostat
• Temperature rating: 107°C
• Mounting: M4

Listed compatibility

• Gaggia Classic / Classic Pro, subject to version verification
• Gaggia Classic 2019
• Gaggia RI9380 and SIN035R references
• Gaggia Carrera and Evolution

Compare the original thermostat's part number, temperature rating, mounting and terminals with your machine's parts diagram. Compatibility is not confirmed for every Classic production version.

Frequently asked questions

What does this thermostat control?

This is the 107°C coffee temperature thermostat used for boiler water temperature control on the listed Gaggia machines. It is not listed here as a steam thermostat or a high-limit safety thermostat.

What is the replacement part number?

The listed part number is 421940202911. Match this reference and the 107°C rating against your original component before purchasing.

Does it fit every Gaggia Classic Pro?

Fitment depends on the machine version. Check your model reference and parts diagram, including the listed Classic 2019, RI9380 and SIN035R references, rather than relying on the Classic Pro name alone.

Will it fix a machine that is not heating?

A heating fault can have several causes. A qualified technician should test the thermostat, heating element, wiring and safety components before deciding which part needs replacement.

What should I know about installation?

Have a qualified technician install the thermostat. Disconnect power and allow the machine to cool before servicing. Do not overtighten the M4 mounting when fitting it into the boiler, as the thermostat can shear off. Never bypass temperature controls or safety devices.

Need help choosing the correct part? Contact Bear Coffee Machine with your machine model and clear photos of the original thermostat and its markings.