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Error code · La Marzocco · Espresso machines

La Marzocco Espresso Machine Message: Autofill In Progress

Autofill In Progress is an information message: the steam boiler autofill cycle is active and water is entering the steam boiler. No action is required. Let it finish, and call a technician only if it keeps running or the machine shuts down with Steam Boiler Autofill Failed.

Medium · inspection needed

Low: an information message that needs no action.

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Code
Autofill In Progress
Maker
La Marzocco
Equipment
Espresso machines
Applies to
Linea PB and Strada AV

What does La Marzocco error code Autofill In Progress mean?

The steam boiler on this machine is kept topped up automatically. When the level falls, the CPU starts an autofill cycle, opens the water path and shows Autofill In Progress while water is entering. The manual classes it as an information message and states that no action is required. The cycle ends by itself when the level probe reports that the boiler is full. Seeing the message now and then is normal, especially after a lot of steaming or after the boiler has been drained for service. What matters is how long it lasts. If it runs for the whole Level Timeout period without the boiler filling, the CPU stops the fill and reports Steam Boiler Autofill Failed instead. So this message is a status line, not a warning in itself.

Affected models and control systems

La Marzocco Linea PB (display software, Operating Manual V3.2) and Strada AV (MAN.16.1.01 V1.0).

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

  • Autofill In Progress on the display
  • The sound of water entering the machine
  • Steam wand output pauses briefly
  • Message appears after heavy steaming

Possible causes

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

  • Steam boiler level fell below the fill point and the autofill cycle started
  • Frequent steaming drawing the steam boiler down between fills
  • Steam boiler level probe coated with scale so it fills for longer
  • Small leak at the steam boiler or its fittings

Safe checks before calling for service

✓ What an operator can do
  1. Leave the machine alone while the message is shown.
  2. Wait for the message to clear, which means the boiler is full.
  3. If it stays on for a long time, check that the water supply is open.
  4. Do not switch the machine off during a fill unless it shuts down.
  5. Note how long the message lasted and how much steaming had been done.

How a technician diagnoses error code Autofill In Progress

  1. Time the autofill cycle and compare it with the Level Timeout parameter.
  2. Check supply pressure and the fill pump or valve operation.
  3. Inspect the steam boiler level probe for scale.
  4. Look for leaks that would make the boiler drop level faster than expected.
  5. Clean or replace the probe and confirm the cycle finishes inside the timeout.
! Leave this to a technician
  • The fill pump and level probe run on line-voltage wiring.
  • The steam boiler holds hot pressurized water and steam.
  • Cleaning a level probe means draining and opening the boiler.

How error code Autofill In Progress differs from similar codes

This message is only a status line. Steam Boiler Autofill Failed is the failure that follows if the boiler does not fill in time.

Technical reference

Maker documentation
La Marzocco owner support
Edition
V3.2 - 12/2015 (La Marzocco S.r.l.)
Models / control
Linea PB and Strada AV
Section
Troubleshooting, printed pp. 104-105 (PDF pp. 104-105)
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.

→Same maker

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Autofill In ProgressQuestions about La Marzocco error code Autofill In Progress
Is Autofill In Progress an error?

No. The manual calls it an information message and requires no action.

How long should it last?

Until the boiler reports full, within the Level Timeout set in the machine.

What if it never ends?

Then the fill is not working, and the machine will eventually show Steam Boiler Autofill Failed. Call a technician.

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