La Marzocco
Steam Boiler Heating Failure
Brew boiler heats but steam boiler does not; no steam pressure builds, steam gauge stays at zero.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Tripped steam boiler high-limit thermostat, failed steam boiler heating element, defective steam boiler SSR/contactor, broken wiring to steam element
How to Fix / Troubleshooting
Safety first: Turn OFF and unplug the machine. Ensure the steam boiler is cool and depressurized before working on it.
Diagnostic steps:
- Reset high-limit thermostat: Locate the manual-reset thermostat on the steam boiler. Press the reset button. If it clicks, restore power and observe if heating resumes.
- Inspect wiring: Check all connections to the steam boiler element and SSR/contactor. Tighten any loose terminals and replace burned connectors.
- Test element resistance: With the machine unplugged, measure resistance across the steam element terminals. An open reading indicates a failed element that must be replaced.
- Check SSR/contactor: When the machine calls for steam heat, verify that the SSR/contactor coil is energized and that output closes. Replace if stuck open or burned.
- Replace failed parts: Install a new La Marzocco steam boiler element or SSR as required, ensuring proper sealing and electrical connections.
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Repair Difficulty
Hard
4/5
Required Part
Steam Boiler Heating Element
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