E05
Gaggia Overheating / Thermal Cut-out on Boiler or Thermoblock

Display shows E05 and machine stops heating or brewing

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Tripped thermal fuse or thermostat, Heavy limescale on boiler, Blocked hydraulic circuit causing dry heating, Failed boiler temperature control on main board

How to Fix / Troubleshooting

Safety first: Unplug the machine and let it cool for at least 45 minutes. Do not attempt to reset thermal devices while the boiler is hot.

User-level steps:

  • Descale thoroughly: Once cool, run a full descaling cycle to remove limescale that can cause localized overheating.
  • Check ventilation: Ensure the machine has adequate space around it and that vents are not blocked.

Internal checks (advanced):

  • Remove the cover to access the boiler/thermoblock.
  • Locate the thermal fuse or manual-reset thermostat attached to the boiler.
  • Inspect wiring: Look for burned connectors or loose spade terminals and reseat them firmly.
  • If the thermostat has a manual reset button, press it gently to reset (if allowed by Gaggia for your model).

If the thermal fuse is open (non-resettable type), it must be replaced. Persistent E05 after replacing the fuse/thermostat suggests a control board or sensor issue that should be diagnosed by a professional.

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Repair Difficulty

Hard 4/5

Required Part

Boiler Thermal Fuse / Thermostat
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