Why Is My DeLonghi Espresso Machine Leaking?

Are you having issues with your DeLonghi espresso machine leaking water? If so, you’re not alone. Many espresso machine users have experienced similar problems with their DeLonghi machines, but don’t worry; it’s a simple problem to troubleshoot and solve. Below are four quick reasons why is your Delonghi espresso machine leaking. 

  1. Loose or Damaged Fittings
  2. Worn-Out Gaskets
  3. Blocked or Clogged Valves
  4. Overfilling the Water Tank

Let’s look at these common causes for a DeLonghi espresso machine leak and the steps you can take to fix the issue.

4 Reasons DeLonghi Espresso Machine Leaking

why is delonghi espresso machine leaking

We know that having a leaky espresso machine can be frustrating. But don’t worry; with a few simple steps, you will be able to diagnose and fix your problem quickly and easily. 

Let’s take a look at four possible reasons why your DeLonghi espresso machine might be leaking and how to solve them.

Reason 1: Loose or Damaged Fittings

The most common cause of an espresso machine leak is loose or damaged fittings on the water lines. If your espresso machine has been in use for a while, these fittings may have become worn down or cracked over time. 

Solution: To fix this issue, simply check all the connections and replace any damaged or worn-out parts.

Reason 2: Worn-Out Gaskets

Another possible reason for an espresso machine leak is worn-out gaskets around the portafilter and other components. 

These gaskets are meant to keep water from escaping the portafilter and other parts of the espresso machine, but over time they can become brittle and cracked, allowing water to escape. 

Solution: The good news is that replacing these gaskets is easy. Simply purchase new ones from your local appliance store and install them according to the manufacturer’s instructions.

Reason 3: Blocked or Clogged Valves

If your DeLonghi espresso machine still leaks after checking for loose fittings and replacing worn-out gaskets, it could be due to clogged or blocked valves inside the boiler itself. 

This can happen if there is too much scale buildup in the boiler, which can prevent water from flowing properly through the system. 

Solution: To clean out these valves, disassemble your espresso machine according to its manual and use a brush or pipe cleaner to remove any debris blocking them. 

Reason 4: Overfilling the Water Tank

Another common cause of leaks in DeLonghi machines is when people overfill their water tanks beyond their capacity level. This causes excess pressure on the tank walls, leading to leaks around their seals. 

Solution: To avoid this problem, make sure you fill up only two-thirds of the tank’s capacity before each use.    

Delonghi Espresso Machine Leaking from the Group Head

One of the most common leaks on an espresso machine is from the group head, which is where your coffee grounds are extracted from. This type of leak is usually caused by either an incorrect grind size or too much pressure applied during extraction. 

If your grind size is too coarse, it could cause an uneven extraction that leads to a leak. 

  • To fix this issue, try adjusting your grinder setting to finer grind size and see if that helps resolve the issue. 
  • Additionally, make sure that you are applying even pressure when pressing down on the portafilter handle while extracting coffee. If the pressure is uneven or too strong, it could cause water to seep out of the group head.

Why is Delonghi Espresso Machine Leaking from the Bottom?

Another common source of leakage in DeLonghi machines is underneath the unit. This type of leak is usually caused by a clogged filter screen or blocked water lines within the unit. 

  • To check for clogs in your filter screen, unplug your machine and remove any parts that may obstruct access to it (such as drip trays). 
  • Once exposed, inspect your filter screen for any blockages or debris preventing water from flowing freely through it. 
  • If any clogs are present, carefully clean them out using a soft-bristled brush.
  • Then reassemble all components before turning your machine back on again and testing for leaks.

If checking for clogged filters does not resolve your issue and your DeLonghi espresso machine continues to leak from underneath. There may be an obstruction within one of its internal water lines that needs attention. 

At this point, I recommend taking your machine to a qualified repair shop that can assess and address any potential blockages safely and efficiently.

Safety Tips to Prevent Delonghi Espresso Machine From Leaking 

  1. Regularly clean the machine and ensure it’s properly maintained.
  2. Only use the recommended amount of water when filling the water tank.
  3. Check the fittings for any signs of looseness or damage before using the machine.
  4. Use high-quality coffee grounds to avoid clogging the valves.
  5. Avoid leaving the machine unused for long periods as it can cause the gaskets to dry out.
  6. Don’t force the machine to work if it’s malfunctioning or not functioning properly.
  7. Follow the manufacturer’s instructions when using and maintaining the machine.
Please Note!Remember that if you suspect an obstruction within one of its internal water lines (or if cleaning out any clogged filters doesn’t seem to help), then it’s best to take your machine to a qualified repair shop that can diagnose and address the problem quickly and efficiently without compromising safety or product integrity. 


There are several potential causes of leaks in DeLonghi espresso machines, such as loose or damaged fittings, worn-out gaskets, blocked valves, or overfilled tanks. 

Now that you know what could be causing your leaking problem, you can take actionable steps toward fixing it quickly. So that you can get back to enjoying barista-level coffee drinks in no time.

With these tips in mind, troubleshooting a DeLonghi espresso machine leak should now be much easier. 

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