Eversys Coffee Machine Error Code W-031: Milk Cleaning Not Correct
W-031 says the milk system cleaning was not performed correctly, so milk drinks may be limited. Check that the milk tube sits in the cleaning container and that it holds enough solution, then run the program again. If W-031 returns, stop serving milk drinks and call us.
Medium: milk drinks may be limited until a correct cleaning completes, while other drinks continue.
- Code
- W-031
- Maker
- Eversys
- Equipment
- Super-automatic coffee
- Applies to
- Cameo (W-xxx warning messages)
What does Eversys error code W-031 mean?
Milk lines need a proper cleaning every day, so the Cameo runs a milk cleaning program and watches how it goes. The program pulls cleaning solution through the milk path from a container where the milk tube is placed. If the machine does not see the cleaning go through as expected, it shows W-031. Staff see the warning and milk drinks may be limited, because the machine will not keep serving milk from a path whose cleaning it cannot confirm. The owner's guide points to the position of the milk tube in the cleaning container. A tube that is not in the liquid pulls air instead of solution, and a container with too little solution runs dry before the cycle ends. A restriction in the milk path can also slow the flow enough to look like a failed cleaning, and the milk system sensors involved in checking the cycle can give a wrong reading. The cleaning program has to complete for the machine to stay in service, so repeating it with the tube and the solution right is the first step. If the warning returns after a correct run, the path or the sensors need testing, and it is safer to pause milk drinks until then. The display text is W-031.
Affected models and control systems
This applies to the Eversys Cameo with W-xxx warning messages on machines with a milk system. W-037 is the separate warning for a milk cleaning run without detergent.
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
- Milk drinks limited
- Warning appears after the milk cleaning program
- Tube looks out of the cleaning liquid
- Cleaning program ends faster than usual
Possible causes
Listed in Eversys's documentation
- Milk tube out of the cleaning container
- Too little cleaning solution in the container
- Restriction in the milk path
- Failing milk system sensor
Other likely causes — what usually sits behind error code W-031 on this control. A technician confirms which one it is before any part is replaced.
- Milk residue that has dried in the line and narrows the passage
- A sensor that reads the cleaning flow wrongly because of film on its surface
Safe checks before calling for service
- Check that the milk tube sits in the cleaning container as the owner's guide shows.
- Make sure the container holds enough cleaning solution.
- Run the milk cleaning program again from the start.
- If W-031 returns, stop serving milk drinks and call us, and tell us how the container was set up.
How a technician diagnoses error code W-031
- Confirm the cleaning program steps and the amount of solution.
- Inspect the milk tube, connectors and valves for residue.
- Run the program and watch the flow through the milk path.
- Check the milk system sensors during the cycle.
- Descale or replace the section that restricts flow.
- A restriction in the milk path is found by taking the lines and valves apart to food-safety standards.
- The milk system sensors are inside the housing and tested with a meter.
- Serving milk from a path that was not cleaned correctly is a food-safety concern.
Technical reference
- Document
- Eversys eSupport: Operator warning messages for Cameo (W-XXX)
- Models / control
- Cameo (W-xxx warning messages)
- Section
- Web page table of W-numbers, Infos messages and Explanations / Remedies (no page numbers)
- 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.
Related Eversys super-automatic coffee error codes
Can I keep serving milk drinks with W-031?
We advise against it. The machine could not confirm the cleaning, so pause milk until it is cleaned properly.
Is W-031 the same as W-037?
No. W-031 is a cleaning that was not performed correctly. W-037 is a cleaning that ran without detergent.
Why did the cleaning fail?
Most often the tube was out of the solution or there was too little in the container.
Need help with Eversys error code W-031?
A technician confirms the cause on site and gives you the price in writing before any work starts.