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Error code · Jura Professional · Super-automatic coffee

Jura WE8 Coffee Machine Message: Filter Symbol Lights Red

The filter symbol at the bottom of the display lights up red when the CLARIS Pro Smart filter cartridge no longer works. Replace the cartridge as the manual describes. If it stays red after a new cartridge, a technician can check the filter detection.

Medium · inspection needed

Low: a maintenance prompt that does not stop the machine.

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Code
Filter symbol lights red
Maker
Jura Professional
Equipment
Super-automatic coffee
Applies to
WE8, JURA Type 737

What does Jura Professional Filter symbol lights red mean?

A water filter cartridge protects the machine from scale and has a limited life. The WE8 counts the water that has gone through the CLARIS Pro Smart cartridge, and when it is spent, the filter symbol at the bottom of the display turns red. The manual says the cartridge no longer works and the action is to replace it. There is no written message, only the symbol. This is a maintenance prompt, not a failure. Leaving it lets scale build up, which leads to descaling prompts and slower heating. A new cartridge that has not been registered in the machine's own procedure can leave the symbol red. The instructions for the WE8 list 220-240 V, 50 Hz. The red symbol is easy to miss because it is small and carries no wording, so it is worth checking the bottom of the display at the start of each day. Each cartridge has a limited capacity and a limited time in service, and whichever limit is reached first turns the symbol red.

Affected models and control systems

JURA WE8, JURA Type 737. Wording is taken from the WE8 instructions for use (Original instructions), which list 220-240 V, 50 Hz in the technical data.

Code numbers and their meaning can change between control generations. We match the full model and control before acting on a code.

What you may notice

  • Filter symbol at the bottom of the display lit red
  • No text message
  • Water tastes or looks different
  • Symbol stays red after fitting a cartridge

Possible causes

Likely causes — what usually sits behind Filter symbol lights red on this control. A technician confirms which one it is before any part is replaced.

  • The CLARIS Pro Smart filter cartridge no longer works
  • New cartridge not registered through the machine's filter procedure
  • Cartridge fitted loosely so it is not detected
  • Filter detection fouled by moisture

Safe checks before calling for service

✓ What an operator can do
  1. Replace the CLARIS Pro Smart cartridge as the manual describes.
  2. Flush the new cartridge before first use, as the instructions say.
  3. Confirm the symbol is no longer red.
  4. Check there are no leaks around the cartridge holder.
  5. If the symbol stays red, note it and tell the service technician.

How a technician diagnoses Filter symbol lights red

  1. Confirm the symbol and the cartridge's installation date.
  2. Check the cartridge seating and holder for leaks.
  3. Verify the filter was registered in the machine procedure.
  4. Inspect the detection for scale and moisture.
  5. Verify the symbol clears.
! Leave this to a technician
  • The water path leads to the heater and pump inside the housing.
  • Scaled parts need flow and electrical tests.
  • The detection may need panels removed.

How Filter symbol lights red differs from similar codes

The WE8 uses the CLARIS Pro Smart cartridge and a red symbol. The GIGA X8 uses CLEARYL Pro Smart and the text Change the filter.

Technical reference

Edition
No revision printed (technical data page lists 220-240 V, 50 Hz)
Models / control
WE8, JURA Type 737
Section
Chapter 6 Display messages (printed p. 36)
Checked
October 2026

We use the maker's document to read the code and do not reproduce it. Always confirm the complete model and control before applying these steps.

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Filter symbol lights redQuestions about Jura Professional Filter symbol lights red
Can I keep using the machine?

It does not stop, but scale builds up.

Why is it still red?

The new cartridge may not be registered.

Is it the same as Decalcify machine?

No.

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Need help with Jura Professional Filter symbol lights red?

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