TROUBLESHOOTING
Quick solutions to common issues
Most espresso and machine issues can be solved with small adjustments or simple checks. Use this guide to identify the problem and apply the recommended solution quickly. If the issue persists, our support team is always ready to help.
Espresso issues
Coffee extracts too fast
Symptoms:
Extraction finishes too quickly (typically under 20–22 seconds)
Coffee appears watery or thin
Weak body and reduced crema
Sour or underdeveloped taste
Most common cause:
Grind size too coarse.
Solution:
Adjust the grinder to a finer setting and try again.
If the problem continues:
Check that the coffee dose is correct (for example, 18 g).
Make sure the coffee is tamped evenly and consistently.
Verify that the coffee is fresh, as older coffee tends to extract faster.
Coffee extracts too slowly
Symptoms:
Extraction takes too long (typically over 35 seconds)
Coffee drips instead of flowing smoothly
Very dark extraction
Bitter or over-extracted taste
Most common cause:
The grind is too fine.
Solution:
Adjust the grinder to a slightly coarser setting and try again.
If needed:
Check that the coffee dose is not too high.
Ensure the dose matches the basket size and is not overfilled.
Channeling
Symptoms:
Coffee sprays during extraction
Uneven or irregular flow
Extraction coming more from one side of the portafilter
Inconsistent or patchy crema
Most common cause:
Uneven coffee distribution in the basket
Uneven or tilted tamping
The grind is too coarse
Solution:
Distribute the coffee evenly in the basket before tamping.
Ensure tamping is level and applied with even pressure.
Adjust the grinder to a slightly finer setting.
Use fresh coffee for optimal extraction quality.
No crema
Symptoms:
Little or no crema
Flat looking espresso
Most common cause:
Old coffee
Improper coffee storage
The grind is too coarse
Solution:
Use fresh coffee (ideally within 4–6 weeks of roast date).
Store coffee in an airtight container away from heat, light, and moisture.
Adjust the grind to a slightly finer setting.
Machine issues
Machine not heating
Possible causes:
The machine is still in the warming-up phase.
Safety protection is active.
Power or internal connection issue.
Solutions:
Wait for the full warm-up time (approximately 5–8 minutes).
Restart the machine.
Check the power connection and ensure it is properly plugged in.
If the problem persists, please contact customer support for further assistance.
No water flow
Possible causes:
The water tank is empty.
The water tank is not properly inserted.
Pump protection has been triggered.
Solutions:
Check the water level in the tank and refill if necessary.
Remove and properly reinsert the water tank.
Restart the machine.
Run a blank shot (water-only cycle) to restore normal flow.
If the issue continues, please contact customer support for further assistance.
Strange noise
Possible causes:
The pump is running without sufficient water.
Air is present in the system.
The water tank is not fully inserted.
Solutions:
Check the water level in the tank and refill if necessary.
Remove and properly reinsert the water tank.
Run a short water flush to remove air from the system.
If a noise continues after checks, please contact customer support for further assistance.
Connectivity issues
App connection problems
Solutions:
Make sure Bluetooth is enabled on your device.
Restart the app.
Restart the machine.
Move your phone closer to the machine to improve signal strength.
Check for available firmware updates and install if necessary.
If pairing fails:
- Remove the machine from the app.
- Reconnect the device following the pairing process again.
Scale connection problems
To clean:
Make sure the scale is fully charged.
Ensure Bluetooth is enabled.
Restart the scale.
Reconnect the scale from the machine settings.
Move the scale closer to the machine to improve connection stability.
White screen in the app
Solution:
Please make sure that both Bluetooth and Location permissions are enabled for the app in your device settings.
The app cannot find the machine
Solutions:
- Close the app completely.
- Restart the app and the Bluetooth(Disable and Enable back Bluetooth) on your device.
- Reopen the app and try connecting again.
This issue is commonly related to Bluetooth connectivity on Android devices.
If the machine is still not detected:
- Unplug the machine from the power source.
- Wait a few seconds.
- Plug the machine back in and try reconnecting again.
Error codes
Understanding error messages
Kubo includes internal protection systems designed to prevent damage and ensure safe operation. When an error occurs, the machine will indicate the cause through its LED pattern and sound.
Errors can also be viewed in the app’s command console, under Settings, once the machine is connected. The table below shows the main errors and how to identify them by sound, LED pattern, and the error code shown in the command console.
Code
10
Error
Machine Banned
LED Pattern
Rapid continuous toggle, all 3 LEDs, every 120 ms (no distinct blink count)
What It Sounds Like
A distinctive falling 3-note tune (high, medium, low), repeating after a short pause — easy to tell apart from the other error sounds
Code
20
Error
Flowmeter Error
LED Pattern
3 blinks (300 ms on/off), then pause
What It Sounds Like
A short high beep followed by a lower beep
Code
21
Error
Pressure Error
LED Pattern
2 blinks (300 ms on/off), then pause
What It Sounds Like
A short high beep followed by a lower beep
Code
22
Error
Thermoblock Temperature Error
LED Pattern
6 blinks (300 ms on/off), then pause
What It Sounds Like
A short high beep followed by a lower beep
Code
23
Error
Boiler Temperature Error
LED Pattern
5 blinks (300 ms on/off), then pause
What It Sounds Like
A short high beep followed by a lower beep
Code
————–
Error
Tank Empty (water level)
LED Pattern
No LED change
What It Sounds Like
Two rising-then-falling chimes played back to back
E10 — Login / internet / server communication issue
Solution
- Unplug the machine and close the app completely on your phone.
- Open the app and make sure you are connected to the internet and logged into your account.
- Once you’ve confirmed you’re logged in, plug the machine back in and reconnect.
This should clear the error. If it persists, please contact customer support for further assistance.
E20 — Flowmeter sensor reading error
Solution
Make sure there is water in the water tank. If the error persists, please contact customer support for further assistance.
E21 — Boiler pressure sensor reading too high or too low
Solution
- Unplug the machine, wait 10 seconds, and plug it back in.
- Make sure the power switch on the right side of the machine is on.
- As soon as the button LEDs turn on, press and hold the flush/coffee button to run a flush — this should release the pressure.
- If that doesn’t resolve it, switch off the machine using the right-side switch and open the app. Check whether the temperature or pressure readings on the main coffee tab look erratic or abnormal.
- If they do, unplug the machine and contact us.
If the error persists, please contact customer support for further assistance.
E22 — Thermoblock temperature sensor: excessive temperature
Solution
- Unplug the machine, wait 10 seconds, and plug it back in.
- Make sure the power switch on the right side of the machine is on.
- As soon as the button LEDs turn on, press the steam button. This will lower the thermoblock temperature and should clear the error.
If the error persists, please contact customer support for further assistance.
E23 — Incorrect reading from the boiler temperature sensor
Solution
- Unplug the machine, wait 10 seconds, and plug it back in.
- Make sure the power switch on the right side of the machine is on.
- As soon as the button LEDs turn on, press and hold the flush/coffee button to run a flush — this should release the pressure.
- If that doesn’t resolve it, switch off the machine using the right-side switch and open the app. Check whether the temperature or pressure readings on the main coffee tab look erratic or abnormal.
- If they do, unplug the machine and contact us.
If the error persists, please contact customer support for further assistance.
Still need help?
Contact Kafmasino support
If your issue is not listed here or you cannot solve the problem, our support team will be happy to help.
Please include:
1. Machine model
2. Description of the issue
3. Photos or video, if possible
4. Error code, if shown
Contact:[email protected]
We aim to respond as quickly as possible.