La Marzocco
La Marzocco Coffee Makers Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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ALARM 1
Machine displays ALARM 1 and will not heat; brew boiler temperature reading is missing or implausible.
Brew Boiler Temperature Probe Failure
ALARM 10
Machine displays ALARM 10; communication error between main control board and group board or display, some groups may be disabled.
Internal Communication Bus Fault
ALARM 11
Machine displays ALARM 11; brew group temperature control error, group head does not reach or maintain set temperature.
Group Head Temperature Control Fault
ALARM 12
Machine displays ALARM 12; hot water tap temperature or flow is abnormal, or hot water function is disabled.
Hot Water Circuit Temperature / Flow Fault
ALARM 13
Machine displays ALARM 13; drip tray or waste water level alarm, machine may stop brewing until emptied.
Drip Tray Level Sensor Fault / Overflow Condition
ALARM 14
Machine displays ALARM 14; internal temperature too high, machine may shut down or disable heating.
Electronics Compartment Overtemperature
ALARM 15
Machine displays ALARM 15; auto-fill timeout or boiler did not reach level within expected time.
Boiler Fill Timeout
ALARM 2
Machine displays ALARM 2 and brew boiler does not heat or overshoots temperature; temperature reading is unstable.
Steam Boiler Temperature Probe Failure
ALARM 3
Machine displays ALARM 3; brew boiler does not fill or stops mid-fill, and pump may run continuously or not at all.
Brew Boiler Level Probe / Fill Circuit Fault
ALARM 4
Machine displays ALARM 4; steam boiler does not fill or overfills, and autofill cycles abnormally.
Steam Boiler Level Probe / Autofill Circuit Fault
ALARM 5
Machine displays ALARM 5; brew boiler temperature rises uncontrollably or is reported as excessively high, and heating is disabled.
Brew Boiler Overtemperature / Overheat Protection Triggered
ALARM 6
Machine displays ALARM 6; steam boiler overheats or temperature is reported as excessively high, and heating is disabled.
Steam Boiler Overtemperature / Overheat Protection Triggered
ALARM 7
Machine displays ALARM 7; pump does not run when expected, or runs continuously without building pressure.
Pump Control / Pressure Fault
ALARM 8
Machine displays ALARM 8; low water pressure or flow is detected, shots are weak or do not start properly.
Low Line Pressure / Inlet Flow Fault
ALARM 9
Machine displays ALARM 9; flowmeter error, volumetric dosing is inaccurate or shots stop prematurely.
Brew Circuit Flowmeter Fault
Symptom
Brew boiler heats but steam boiler does not; no steam pressure builds, steam gauge stays at zero.
Steam Boiler Heating Failure
Symptom
Brew pressure is too high (above ~10 bar) and shots run too fast or channel.
Overpressure Brew Circuit
Symptom
Brew pressure is too low (below ~8 bar) and shots are under-extracted even with fine grind.
Underpressure Brew Circuit
Symptom
Display or control panel is blank or partially unreadable, but machine otherwise heats and pumps.
User Interface / Display Failure
Symptom
Group head is cold to the touch and brew water cools rapidly at the group, even though boiler is at temperature.
Group Thermal Isolation / Circulation Issue
Symptom
Hot water tap drips or flows slowly even when turned off.
Leaking Hot Water Valve
Symptom
Machine does not start a shot when brew button is pressed; no pump or valve activation.
Brew Activation / Input Fault
Symptom
Machine emits a strong burnt smell or visible smoke from vents.
Electrical Overheating / Component Burnout
Symptom
Machine frequently trips the building circuit breaker or RCD when heating or brewing.
Electrical Short or Ground Fault
Symptom
Machine heats but cannot reach target brew temperature; brew temperature is consistently low.
Underheating Brew Boiler / PID Miscalibration
Symptom
Machine overheats brew water; shots taste burnt and brew temperature is higher than setpoint.
Brew Boiler Overheating Without Alarm
Symptom
Machine powers on but does not heat; both brew and steam boilers remain cold and temperature does not rise.
Global Heating Circuit Failure
Symptom
No power: La Marzocco coffee machine completely dead, no lights or display, does not respond to power switch.
Main Power Input / Safety Device Failure
Symptom
No water from group head when brew button is pressed; pump may run but no flow at the portafilter.
Brew Circuit Blockage
Symptom
Pump is very loud or makes grinding noises during operation.
Rotary Pump Mechanical Wear or Cavitation
Symptom
Steam boiler heats and builds pressure, but brew boiler remains cold; coffee is lukewarm or cold.
Brew Boiler Heating Failure
Symptom
Steam pressure is low; steam wand produces weak steam and struggles to texture milk.
Low Steam Pressure / Capacity
Symptom
Steam wand drips water or steam continuously even when the steam knob/lever is fully closed.
Leaking Steam Valve
Symptom
Steam wand spits excessive water before producing dry steam; milk texture is inconsistent.
Wet Steam / Condensation in Steam Circuit
Symptom
Volumetric dosing is inconsistent; shot volumes vary significantly from one pull to the next.
Inaccurate Flow Measurement / Dosing
Symptom
Water backs up into drip tray during brewing; significant flow from drain hose while pulling a shot.
Overactive Expansion Valve / Overpressure Bypass
Symptom
Water continuously drips from group head even when no brew is selected.
Leaking Group 3-Way Solenoid
Symptom
Water leaks from the bottom of the machine or inside the cabinet during operation.
Internal Plumbing Leak
Symptom
Water or steam escapes from the safety valve on top of the boiler.
Boiler Overpressure / Safety Valve Venting
Symptom
Weak flow from group head; shots run very slowly even with coarse grind and no portafilter shows reduced flow.
Restricted Brew Flow
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| ALARM 1 |
Machine displays ALARM 1 and will not heat; brew boiler temperature reading is missing or implausible.
|
Brew Boiler Temperature Probe Failure | View Details |
| ALARM 10 |
Machine displays ALARM 10; communication error between main control board and group board or display, some groups may be disabled.
|
Internal Communication Bus Fault | View Details |
| ALARM 11 |
Machine displays ALARM 11; brew group temperature control error, group head does not reach or maintain set temperature.
|
Group Head Temperature Control Fault | View Details |
| ALARM 12 |
Machine displays ALARM 12; hot water tap temperature or flow is abnormal, or hot water function is disabled.
|
Hot Water Circuit Temperature / Flow Fault | View Details |
| ALARM 13 |
Machine displays ALARM 13; drip tray or waste water level alarm, machine may stop brewing until emptied.
|
Drip Tray Level Sensor Fault / Overflow Condition | View Details |
| ALARM 14 |
Machine displays ALARM 14; internal temperature too high, machine may shut down or disable heating.
|
Electronics Compartment Overtemperature | View Details |
| ALARM 15 |
Machine displays ALARM 15; auto-fill timeout or boiler did not reach level within expected time.
|
Boiler Fill Timeout | View Details |
| ALARM 2 |
Machine displays ALARM 2 and brew boiler does not heat or overshoots temperature; temperature reading is unstable.
|
Steam Boiler Temperature Probe Failure | View Details |
| ALARM 3 |
Machine displays ALARM 3; brew boiler does not fill or stops mid-fill, and pump may run continuously or not at all.
|
Brew Boiler Level Probe / Fill Circuit Fault | View Details |
| ALARM 4 |
Machine displays ALARM 4; steam boiler does not fill or overfills, and autofill cycles abnormally.
|
Steam Boiler Level Probe / Autofill Circuit Fault | View Details |
| ALARM 5 |
Machine displays ALARM 5; brew boiler temperature rises uncontrollably or is reported as excessively high, and heating is disabled.
|
Brew Boiler Overtemperature / Overheat Protection Triggered | View Details |
| ALARM 6 |
Machine displays ALARM 6; steam boiler overheats or temperature is reported as excessively high, and heating is disabled.
|
Steam Boiler Overtemperature / Overheat Protection Triggered | View Details |
| ALARM 7 |
Machine displays ALARM 7; pump does not run when expected, or runs continuously without building pressure.
|
Pump Control / Pressure Fault | View Details |
| ALARM 8 |
Machine displays ALARM 8; low water pressure or flow is detected, shots are weak or do not start properly.
|
Low Line Pressure / Inlet Flow Fault | View Details |
| ALARM 9 |
Machine displays ALARM 9; flowmeter error, volumetric dosing is inaccurate or shots stop prematurely.
|
Brew Circuit Flowmeter Fault | View Details |
| – |
Brew boiler heats but steam boiler does not; no steam pressure builds, steam gauge stays at zero.
|
Steam Boiler Heating Failure | View Details |
| – |
Brew pressure is too high (above ~10 bar) and shots run too fast or channel.
|
Overpressure Brew Circuit | View Details |
| – |
Brew pressure is too low (below ~8 bar) and shots are under-extracted even with fine grind.
|
Underpressure Brew Circuit | View Details |
| – |
Display or control panel is blank or partially unreadable, but machine otherwise heats and pumps.
|
User Interface / Display Failure | View Details |
| – |
Group head is cold to the touch and brew water cools rapidly at the group, even though boiler is at temperature.
|
Group Thermal Isolation / Circulation Issue | View Details |
| – |
Hot water tap drips or flows slowly even when turned off.
|
Leaking Hot Water Valve | View Details |
| – |
Machine does not start a shot when brew button is pressed; no pump or valve activation.
|
Brew Activation / Input Fault | View Details |
| – |
Machine emits a strong burnt smell or visible smoke from vents.
|
Electrical Overheating / Component Burnout | View Details |
| – |
Machine frequently trips the building circuit breaker or RCD when heating or brewing.
|
Electrical Short or Ground Fault | View Details |
| – |
Machine heats but cannot reach target brew temperature; brew temperature is consistently low.
|
Underheating Brew Boiler / PID Miscalibration | View Details |
| – |
Machine overheats brew water; shots taste burnt and brew temperature is higher than setpoint.
|
Brew Boiler Overheating Without Alarm | View Details |
| – |
Machine powers on but does not heat; both brew and steam boilers remain cold and temperature does not rise.
|
Global Heating Circuit Failure | View Details |
| – |
No power: La Marzocco coffee machine completely dead, no lights or display, does not respond to power switch.
|
Main Power Input / Safety Device Failure | View Details |
| – |
No water from group head when brew button is pressed; pump may run but no flow at the portafilter.
|
Brew Circuit Blockage | View Details |
| – |
Pump is very loud or makes grinding noises during operation.
|
Rotary Pump Mechanical Wear or Cavitation | View Details |
| – |
Steam boiler heats and builds pressure, but brew boiler remains cold; coffee is lukewarm or cold.
|
Brew Boiler Heating Failure | View Details |
| – |
Steam pressure is low; steam wand produces weak steam and struggles to texture milk.
|
Low Steam Pressure / Capacity | View Details |
| – |
Steam wand drips water or steam continuously even when the steam knob/lever is fully closed.
|
Leaking Steam Valve | View Details |
| – |
Steam wand spits excessive water before producing dry steam; milk texture is inconsistent.
|
Wet Steam / Condensation in Steam Circuit | View Details |
| – |
Volumetric dosing is inconsistent; shot volumes vary significantly from one pull to the next.
|
Inaccurate Flow Measurement / Dosing | View Details |
| – |
Water backs up into drip tray during brewing; significant flow from drain hose while pulling a shot.
|
Overactive Expansion Valve / Overpressure Bypass | View Details |
| – |
Water continuously drips from group head even when no brew is selected.
|
Leaking Group 3-Way Solenoid | View Details |
| – |
Water leaks from the bottom of the machine or inside the cabinet during operation.
|
Internal Plumbing Leak | View Details |
| – |
Water or steam escapes from the safety valve on top of the boiler.
|
Boiler Overpressure / Safety Valve Venting | View Details |
| – |
Weak flow from group head; shots run very slowly even with coarse grind and no portafilter shows reduced flow.
|
Restricted Brew Flow | View Details |
No matching codes found
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