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LUCCA M58 Sunto Espresso Machine: User Manual

Set Up Your LUCCA M58 Sunto. In this manual, you should find everything you need to operate and maintain your E61 dual-boiler espresso machine.

Please read carefully before using your LUCCA M58 Sunto Espresso Machine.

If you have any other questions, please contact us.

Setup Video

The setup video is forthcoming. 

Included Accessories

Water

Espresso machines have specific water requirements. Two primary considerations are filtration and hardness.

Filtration removes tiny particles, such as sand or rust, from your water. If these particles were allowed to enter your machine, they could cause all manner of trouble, particularly by clogging the precise valves and mechanisms in your espresso machine. Almost any water filter will do the job, whether it’s the one built into your fridge or a whole-house filter. Replacing this filter at the proper time is important to ensure machine health.

Water hardness is equally important. Ideally, we want a hardness of between 35-85 ppm (parts per million). Hardness refers to the dissolved solids in your water. Common dissolved solids are things like magnesium, calcium, and various forms of sodium. These dissolved solids are what make water, and therefore espresso, taste good. But too much will result in scale buildup in your machine. Scale can cause irreparable damage to your machine by clogging and forming a mineralized layer over the surface of metal parts. The descaling process is even more damaging, eating away at the machine's metal internals. Luckily, scale can be entirely avoided by keeping your water hardness within the recommended TDS range of 35-85 ppm.

There are numerous methods to soften your water should its dissolved solid content be too high.

A note on RO (Reverse Osmosis) or Distilled Water

Taste aside, espresso machines require some mineral content to function properly. Their steam boiler fill probes, in particular, use water's conductivity to detect the water level. With no dissolved solids, they’ll overfill, giving you water instead of steam. You must add some mineral content back in. Our recommendation is Third Wave Water packets, which are designed to offer ideal flavor and to be safe for your machine.

Reservoir Solutions

Our first recommendation is an in-reservoir water softening pouch. They’re affordable, last 4-6 months, and are very effective. Another great option is to use RO water purchased by the gallon, combined with Third Wave Water packets.

Direct Plumb Solutions

For plumbed-in machines, we recommend our Home Water Softening and Filtration kit. It includes everything you’ll need to ensure the water is safe for your machine and delivers the best- tasting espresso.

No matter which solution you pick, we recommend testing the water coming from your machine’s group head every few months. City water hardness changes seasonally, and softening systems wear out. Routine testing will ensure you keep your machine safe.

First-Time Setup with the Reservoir

NOTE: The M58 Sunto comes ready to use with the reservoir. If you plan on using the machine in reservoir mode, you do not need to change any settings. The M58 Sunto uses an OLED PID controller to manage the water supply. Before using the machine on the internal reservoir for the first time:

  1. Fill the 3L reservoir with your filtered and softened water, leaving a few inches at the top to prevent spillage. The reservoir is removable for filling and for cleaning. 
  2. In the OLED menu, navigate to WATER TANK and confirm it is set to YES. (See the OLED PID Settings section for menu navigation.)
  3. Do not spill water onto the machine when filling, as this may cause electrical damage.
  4. Located near the direct water line connection under the machine, the black switch next to the ball valve (machine water connection) should already be pointing outward by default.  

No water in the tank

If the water level in the tank falls below the minimum level, the machine emits three beeps while the tank indication appears on the display.

Note: The PID controller and heating elements will turn off if the reservoir runs low. Refill and power-cycle to resume.

First-Time Setup with Direct Plumb

To configure the M58 Sunto for direct plumb operation, you need this braided water line and, for most configurations, this 3/8" to 3/8" quick-connect fitting. A plumbing kit that bundles what you need is forthcoming. Once you have these items and your softening and filtration set up: 

  1. Fasten the included braided water line to the pump inlet at the bottom of the machine — hand-tight, then a quarter-turn with an adjustable wrench.
  2. Open your water line and check all connection points for leaks.
  3. Verify that the line pressure going into the machine is 30–45 PSI. Too little or too much pressure can cause premature wear. Install a pressure regulator on the line if you are unsure of your supply pressure.
  4. In the OLED menu, navigate to WATER TANK and set it to NO. (See the OLED PID Settings section for menu navigation.
  5. Move the black switch next to the ball valve (machine water connection). Move the switch inward to set the machine into plumb mode.

⚠ Only change the WATER TANK setting if the direct plumb kit is physically installed.

OLED PID Settings

The M58 Sunto features a new OLED PID display, replacing the blue numeric PID on the original M58. It shows both boiler temperatures simultaneously and provides access to all machine settings through a simple two-button menu.

  • Display at Startup

When you turn the machine on, the OLED displays the "QUICK" logo for a few seconds, then shows both boiler temperatures. A heating element symbol appears next to each temperature while the boilers are warming up, and it disappears once the target temperature is reached.

The M58 Sunto has "Instant Stability": A dedicated heating element in the group head brings the M58 Sunto to full brewing temperature in just 12 minutes, which is 40% faster than standard E61 machines. The steam boiler will begin heating after the brew boiler is heated. 

  • Adjusting Brew Temperature Directly

From the main temperature display, press either side button to adjust the brew boiler temperature directly. The target temperature appears and can be raised or lowered with the left (–) and right (+) buttons. After a few seconds of inactivity, the display returns to showing live temperatures.

We recommend keeping the brew temperature between 195°F and 203°F (90–93°C) for the brew temperature: lower for darker roasts, higher for lighter ones.

  • Entering the Settings Menu

Press and hold the up arrow button for 10 seconds to enter the full settings menu. The menu navigates left-to-right with the right arrow button, and settings within each screen are changed with the left arrow button.

  • Temperature Units

The first menu screen shows TEMP. UNIT. Use the left button to toggle between °C and °F.

  • ECO and Standby Modes

Press the right arrow from the temperature unit screen to reach STANDBY / ECO.

ECO Mode: Lowers the steam boiler set point to 60°C (140°F) to reduce energy consumption when the machine is idle. Use the left button to set the ECO timer to 30, 60, or 90 minutes, or OFF.

Standby Mode: Turns off the boiler heating elements entirely. Use the left button to set the Standby timer to 30, 60, or 90 minutes, or OFF.

Note: If both ECO and Standby are enabled, Standby takes priority. To use ECO mode alone, make sure Standby is set to OFF.

To exit either mode: lift and lower the brew lever, or power cycle the machine.

  • Screen Saver

After 30 minutes without a shot being pulled, the OLED display turns off automatically while the machine continues heating. Press either side button to wake the display.

  • Buzzer

Press the right arrow from the STANDBY / ECO screen to reach ENABLE BUZZER. Use the left button to toggle ON or OFF. When enabled, the buzzer sounds three times to warn of a low water condition.

  • Probes Sensor Sensitivity

Press the right arrow from the BUZZER screen to reach PROBES SENS. Use the left button to set the water level probe sensitivity to High, Medium, or Low. The default is High. The lower settings may be useful if the machine triggers false low-water warnings with your water supply.

  • Pre-Infusion

Press the right arrow from PROBES SENS. to reach PREINFUSION. Use the left button to set pre-infusion duration from 0 to 10 seconds, or OFF.

When enabled, lifting the brew lever initiates the pre-infusion phase where water gently saturates the puck before full pressure begins. Pre-infusion time is counted toward the total shot timer displayed on the OLED.

  • Water Tank

Press the right arrow from PREINFUSION to reach WATER TANK. Use the left button to toggle YES (internal reservoir) or NO (direct plumb).

⚠ Only change this setting if the direct plumb kit is physically installed on the machine.

  • Service Boiler (Steam Boiler On/Off)

Press the right arrow from WATER TANK to reach SERVICE BOILER. Use the left button to toggle the steam boiler ON or OFF. This allows you to run the machine as a single-boiler brew-only setup if needed.

  • Service Target (Steam Boiler Temperature)

Press the right arrow from SERVICE BOILER to reach SERVICE TARGET. Use the left button to set the steam boiler temperature between 70°C and 130°C.

⚠ After making any change to Service Target, wait five seconds before pressing the right arrow to exit the menu so the setting is saved.

  • Low Water Alarm

If the reservoir drops below the minimum level, the machine sounds three beeps (if buzzer is enabled) and the OLED displays a water tank icon. The boiler continues heating, so you can refill and resume without a power cycle.

To clear the alarm, simply refill the reservoir.

  • Boiler Fill Timeout

If the boiler filling cycle exceeds 120 seconds, the machine goes into an alarm state: the buzzer sounds and the OLED displays "TIMEOUT." Heating will not start in this state.

This typically occurs the very first time the machine is used with a completely empty boiler. Power cycle the machine to restart the fill cycle. If the timeout recurs, check for leaks or obstructions in the water circuit.

Technical Details

For a complete list of technical details, please see the spec table on our product page.

Now you're ready to start pulling shots! Check out our Espresso 101 section to learn about steaming milk, latte art, our suggested starter espresso recipe, grinder dial-in tips, and much more.

Looking for Help with Flow Control?

 Additional Resources: 

If you need help dialing in your equipment or pulling shots, check out the articles below or contact our coffee experts and technicians.