Eversys Coffee Machine Error Code S-104: Filling Steam Boiler

What does Eversys error code S-104 mean?

S-104 is a progress message on the Eversys Cameo. The screen reads "Fill steam boiler..." and the e'Support table explains the trigger: if the water level is lower than the security level, the steam boiler has to be filled. The control watches the level in the boiler and will not let steam production go on with too little water, since a boiler that runs low can overheat. So it fills first, and the table's action is just to wait until the steam boiler is filled. No causes are listed, because a low level after start-up, after the boiler was emptied, or after a lot of steam use is an ordinary reason for the machine to top up. The table does not say how long the fill takes, and it does not say what the machine does if the level never reaches the mark. If the message stays up for an unusually long time, that is the point where a technician is needed, because the filling itself is no longer working as the table describes.

Affected models and control systems

Eversys Cameo range (Cameo/Core, Classic, ST and in-box versions). The message is listed in Eversys' e'Support table of operator stop messages for Cameo, and the table gives no board revision or model limit.

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

• The screen shows "Fill steam boiler..."
• Steam drinks are paused while filling
• A pump or valve sound can be heard from inside the machine

Possible causes

Likely causes — what usually sits behind error code S-104 on this control. A technician confirms which one it is before any part is replaced.

• Water level in the steam boiler is below the security level
• Water supply to the machine is shut or low, so the boiler cannot fill
• The boiler was just emptied (S-102) and is refilling from empty
• A level probe coated with scale reads low even after the boiler is full

Safe checks before calling for service

How a technician diagnoses error code S-104

1. Confirm S-104 against the Cameo table and check when the boiler was last emptied.
2. Verify water supply pressure and the inlet filter.
3. Watch the fill and confirm the level reaches the mark.
4. Inspect the level probe for scale and test its reading.
5. Check the fill valve and pump operation before replacing anything.

How error code S-104 differs from similar codes

S-104 is the filling counterpart to S-102, where the boiler is emptied.

Technical reference

Document

Operator stop messages for Cameo (S-XXX)

Models / control

Eversys Cameo range (Cameo/Core, Classic, ST, in-box), e'Support article

Section

Web page table of S-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.