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Error code · La Marzocco · Espresso machines

La Marzocco Espresso Machine Error Code: Coffee Boiler 1 Is Not Heating

Coffee Boiler 1 Is Not Heating means the coffee boiler did not reach the minimum temperature within the programmed interval. The manual refers to the Heating Timeout parameter, and the number shown is the number of the affected coffee boiler. A service technician should check the heating circuit.

Medium · inspection needed

High: the boiler cannot reach temperature, so the machine cannot brew.

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Code
Coffee Boiler 1 Is Not Heating
Maker
La Marzocco
Equipment
Espresso machines
Applies to
Linea PB and Strada AV

What does La Marzocco Coffee Boiler 1 Is Not Heating mean?

When the machine heats up, the CPU sets a time limit for the coffee boiler to reach its minimum temperature. That limit is the Heating Timeout parameter. If the boiler is still below minimum when the time runs out, the CPU shows Coffee Boiler 1 Is Not Heating. The manual notes that the number on the display is the number of the affected coffee boiler. The cause may be the heating element, the circuit that switches it, a safety thermostat, the electrical supply, or simply a timeout that is too short for the installation. A boiler probe that reads wrongly can also look like a failure to heat. The message is different from the probe message, which says the probe is not detected at all.

Affected models and control systems

La Marzocco Linea PB (display software, Operating Manual V3.2) and Strada AV (MAN.16.1.01 V1.0). Boiler names and numbers on the display follow the machine's group and boiler count.

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

  • Coffee Boiler 1 Is Not Heating on the display
  • Group head stays cold
  • Machine never reaches brew temperature
  • Message returns after switching on

Possible causes

Likely causes — what usually sits behind Coffee Boiler 1 Is Not Heating on this control. A technician confirms which one it is before any part is replaced.

  • Coffee boiler heating element burned out
  • Heater relay or safety thermostat open
  • Missing phase or low voltage at the machine
  • Heating Timeout shorter than the boiler needs

Safe checks before calling for service

✓ What an operator can do
  1. Check that the machine's breaker and wall disconnect are on.
  2. Switch off and on once to see whether it heats.
  3. Do not keep restarting if it does not.
  4. Keep clear of the boiler area.
  5. Note how long the machine ran and whether the steam boiler heated normally.

How a technician diagnoses Coffee Boiler 1 Is Not Heating

  1. Read the message and the Heating Timeout parameter.
  2. Measure supply voltage on every phase under load.
  3. Check the element for continuity and leakage to ground with power off.
  4. Test the heater relay and safety thermostat.
  5. Confirm the probe reads correctly, adjust only after fixing the cause, and replace the failed part.
! Leave this to a technician
  • Heating circuits draw high current at line voltage.
  • The boiler holds hot pressurized water.
  • Choosing among element, relay and supply needs a meter.

How Coffee Boiler 1 Is Not Heating differs from similar codes

This message is about the coffee boiler failing to reach temperature in time. The overheating message is the opposite case.

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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Coffee Boiler 1 Is Not HeatingQuestions about La Marzocco Coffee Boiler 1 Is Not Heating
What is Heating Timeout?

The parameter that sets how long the boiler may take to reach its minimum temperature.

Does number 1 matter?

It is the coffee boiler the message refers to.

Is it the probe?

A probe that is not detected at all shows a different message, so this one points toward the heating side.

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Need help with La Marzocco Coffee Boiler 1 Is Not Heating?

A technician confirms the cause on site and gives you the price in writing before any work starts.

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