Error 15
Jura General Heating System / Overtemperature Fault

Display shows “Error 15”; machine may not complete startup or may shut down during heating.

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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

Overheated thermoblock due to scale, Faulty NTC sensor reading incorrect temperature, Blocked hydraulic circuit causing dry heating, Defective main control board temperature logic

How to Fix / Troubleshooting

Safety first: Unplug the machine and allow it to cool fully before working on it.

Step 1 – Allow to cool and reset:

  • Leave the machine unplugged for 30 minutes.
  • Plug back in and test; if the error clears temporarily, overheating is confirmed.

Step 2 – Descale thoroughly:

  • Run one or two full descaling cycles with Jura descaling tablets.
  • Ensure the water tank is clean and the filter (if used) is not clogged.

Step 3 – Check for flow restrictions (advanced):

  • Remove the housing (unplug first).
  • Inspect hoses, flow meter, and valves for kinks or blockages.
  • Verify that water flows freely through the thermoblock when the pump runs.

Step 4 – Sensor and board checks:

  • Inspect the NTC sensor on the thermoblock and its wiring.
  • Replace the sensor if it is damaged or reading incorrectly.
  • If the sensor is good but the machine still reports overtemperature, the main control board may be faulty.
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Repair Difficulty

Professional Required 5/5

Required Part

Thermoblock NTC Temperature Sensor
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