Diletta Alto Espresso Machine

Unboxing Your Diletta Alto

1. Before continuing, check the box for damage and punctures. If significant damage is noted to outer packaging, stop and call Seattle Coffee Gear Customer Service at 866-372-4734.
2. Remove top foam packaging and set aside.
3. Reach around the sides of your machine until you have a firm grasp of the machine base. Do not attempt to lift the machine by the cup rail.
4. Lift carefully and set machine on countertop, ensuring all 4 legs make good contact.
5. Remove the outer dust bag and accessory box; set aside.
6. Save packaging for potential future use.

Initial Setup

1. Check power cable and connector for kinks, then plug into the rear of the machine and into the wall socket.
2. Locate the top water tank access hatch; remove the water tank.
3. Rinse the water tank and fill with filtered water, then replace.
4. Locate the power switch and turn the machine on. Both PID displays will illuminate — one for the brew boiler, one for the steam boiler.
5. Open the hot water tap briefly to prime the system — allow water to flow for approximately 30 seconds into a container, then close.
6. Allow a minimum of 15–20 minutes for both boilers to reach and stabilize at their target temperatures before use.
7. Steam is ready when the steam boiler PID reads its set temperature and the indicator is solid.

Brewing Your First Shot

1. Remove the portafilter from the group head by turning it clockwise.
2. Fill the portafilter with one or two doses of freshly ground coffee using the appropriate basket.
3. Tamp the coffee firmly and evenly with the included tamper.
4. Reinsert the portafilter into the group, turning it counter-clockwise until snug.
5. Place your cups under the portafilter spouts.
6. Lift the brew lever to start flow. The PID display will switch to a shot timer.
7. Lower the lever to stop flow when you've reached your target yield (typically 36g out for a double).

Adjusting Brew and Steam Temperatures
The Alto provides independent PID control for both boilers. To adjust brew temperature: press and hold the brew PID button to enter the temperature menu, adjust using +/– controls, and confirm. Repeat for steam using the steam PID button. Brew: 93°C–96°C is a good starting range. Steam: 125°C–130°C is typical for good steam pressure. Allow 5 minutes after any change to stabilize.

Using the Shot Timer
When you start the brew, the PID display automatically switches to a shot timer counting up in seconds. Your target is 25–30 seconds for a double shot. If your shot runs long, grind coarser. If it runs short, grind finer. The timer resets when you stop the brew.

Adjusting Brew Pressure (OPV)
The Alto features a top-accessible OPV. Remove the top panel to access the adjustment knob. Standard target is 9 bar. Turn clockwise to increase, counter-clockwise to decrease. Use a pressure gauge portafilter to confirm.

Using Eco Mode
Eco Mode lowers boiler temperature(s) to reduce energy consumption while still allowing faster recovery to brew temperature. To toggle: press and hold the eco mode button for 3 seconds until the indicator blinks to confirm. Ideal for users who take long breaks between shots.

Programmable Pre-Infusion
Pre-infusion gently wets the puck before full brew pressure is applied, which can improve extraction evenness. Enter the PID programming menu and navigate to the pre-infusion setting. You can program up to 10 seconds. A 3–5 second pre-infusion is a good starting point. Set to 0 seconds to disable.

Using Flow Control (Alto Flow Control Version Only)
The flow control paddle lets you manually adjust pump pressure throughout the shot. Common profiles include a slow pre-infusion ramp (start low, increase to 9 bar at ~10 seconds), a flat 9 bar pull, or a decline profile. Begin with flat 9 bar before experimenting. A group pressure gauge is recommended for accurate profiling.

Steaming Milk (Paddle Controls)

1. Tap the steam paddle once to open the steam valve.
2. Submerge the steam tip just below the surface of cold milk.
3. Keep the tip near the surface to stretch the milk to your desired volume.
4. Angle the pitcher to create a swirling vortex and heat to approximately 60–65°C / 140–150°F.
5. Tap the steam paddle again to close the valve, remove the wand, and wipe immediately with a damp microfiber cloth.
6. Purge the wand briefly to clear any remaining milk.

Dialing In Your Espresso
Dialing in is the process of adjusting grind size to achieve the right extraction. Start here:
• Dose: 18g in (standard double basket)
• Yield: 36g out (2:1 ratio)
• Time: 25–30 seconds

If your shot pulls faster than 25 seconds: grind finer.
If your shot pulls slower than 30 seconds: grind coarser.
Make one adjustment at a time. Use a scale to track yield consistently.

After Each Use

• Wipe the steam wand immediately after steaming with a damp microfiber cloth, then purge briefly to clear the tip.
• Remove the portafilter, knock out the spent puck, and rinse the basket under hot water.
• Empty and rinse the drip tray as needed.

Weekly

• Soak the portafilter and basket in a solution of espresso cleaner (such as Cafiza or Pallo Coffee Tool Cleaner) for 20–30 minutes, then rinse thoroughly.

Exterior Cleaning

• Wipe down stainless steel and painted surfaces with a soft, dry microfiber cloth. Avoid abrasive pads or sponges.
• For chrome surfaces and fittings, apply ammonia-free glass cleaner to a microfiber cloth and wipe — never spray directly onto the machine.
• Keep liquids away from the PID display and any electrical controls when cleaning.

Machine won't turn on
Check that the power cable is fully seated and the wall outlet is functioning. If the machine still does not power on, contact SCG support at 866-372-4734.

Pump runs but no water flows from the group
The water tank may be empty or not fully seated. Remove, refill, and firmly reseat. If it persists, turn off the machine, wait 10 seconds, and try again.

Shot runs too fast (under 20 seconds)
Your grind is too coarse or dose too low. Grind finer and/or increase your dose. Ensure the coffee is tamped firmly — a loose tamp creates channels that allow water through too quickly.

Shot runs too slow (over 35 seconds) or won't flow
Your grind is too fine, dose too high, or tamp too hard. Grind coarser and check your dose. Inspect the shower screen and portafilter basket for clogging.

Steam pressure is weak or steam is mostly water
Allow additional heat-up time (2–3 more minutes) and try again. If steam is watery, purge the wand briefly before steaming to clear condensation. If the issue persists, contact SCG support.

Machine is leaking from the group head
A leak at the portafilter-to-group seal is usually a worn group head gasket. Inspect the rubber gasket in the group — if cracked, flattened, or visibly worn, it needs replacement. Contact SCG for assistance sourcing the correct 58mm replacement gasket.

PID is displaying an error or unusual reading
Turn the machine off and allow it to cool for 10 minutes, then restart. If the error persists, the temperature probe may need inspection. Contact SCG support for next steps.

Steam boiler not reaching temperature
On the Alto, the steam boiler heats independently from the brew boiler. If the steam PID shows a temperature far below target after 15+ minutes, the steam boiler thermocouple or heating element may need service. Contact SCG support.

Still having issues?
Contact Seattle Coffee Gear support at 866-372-4734 or support@seattlecoffeegear.com, Monday–Friday, 8am–5pm PST. Our team handles Diletta warranty service directly.