A small amount of water in the drip tray is completely normal on a Jura coffee machine. During brewing, rinsing and cleaning, excess water is automatically diverted into the drip tray to keep the hydraulic system operating correctly.

However, if water is leaking onto your worktop, underneath the machine or from the front, side or rear panels, there is likely to be a fault that requires attention.

The location of the leak is often the best clue to identifying the cause.

Your Jura machine may:

Leak underneath the machine.
Leak during brewing.
Leak during rinsing.
Leak while making milk drinks.
Fill the drip tray unusually quickly.
Leave puddles on the worktop.
Leak from the water tank area.
Leak from the steam or milk system.

One of the simplest causes of leaking is an incorrectly fitted water tank.

Remove the tank and inspect:

• The tank base.
  
• The outlet valve.
  
• The sealing gasket.
  
• The connection point inside the machine.
  

Refit the tank securely and check for damage or cracks.

The spring-loaded valve at the bottom of the water tank can wear over time.

Signs include:

• Water dripping as soon as the tank is removed.
  
• Leaks around the rear of the machine.
  
• Water collecting beneath the tank.
  

Replacing the valve or water tank usually resolves the issue.

Blocked Drainage System

Coffee oils and scale can restrict the internal drainage channels.

This may cause water to overflow into areas where it should not.

Running the recommended cleaning and descaling programmes can often restore normal drainage.

Jura machines contain numerous O-rings and seals throughout the hydraulic system.

Over time these seals can become:

• Brittle.
  
• Flattened.
  
• Split.
  
• Worn.
  

A failed seal may allow water to escape during brewing or rinsing.

Internal silicone hoses carry water between the pump, thermoblock, valves and brew unit.

Leaks may develop due to:

• Age.
  
• Heat.
  
• Vibration.
  
• Loose hose clips.
  
• Accidental damage.
  

These faults normally require the machine to be dismantled.

The brew unit operates under pressure every time coffee is prepared.

If the brew unit seals become worn, water may escape internally rather than passing through the coffee puck correctly.

Common symptoms include:

• 
  Wet coffee grounds.
  
• 
  Water inside the machine.
  
• 
  Weak coffee.
  
• 
  Water entering the drip tray excessively.

If leaks only occur when preparing milk drinks, inspect the complete milk circuit.

Check:

• Milk hoses.
  
• Connectors.
  
• Frother components.
  
• Milk container fittings.
  

Milk residue can prevent seals from seating correctly, leading to leaks.

Although less common, leaks can develop around:

• The thermoblock.
  
• Ceramic valves.
  
• Solenoid valves.
  
• Internal connectors.
  

These components operate under high pressure and generally require professional diagnosis.

Before arranging a repair:

• Empty and correctly refit the drip tray.
  
• Check whether the water tank is damaged.
  
• Inspect the water tank valve.
  
• Complete the automatic cleaning programme.
  
• Run a descaling programme if due.
  
• Clean the milk system thoroughly.
  
• Check all removable components are correctly installed.
  
• Observe exactly when the leak occurs.
  
• Identify whether the leak appears underneath, inside or from the front of the machine.