Coffee does not flow from the coffee machine: DIY diagnostics and repairs

You pressed a button and heard the usual buzzing sound, but instead of aromatic espresso there was silence or rare drops? The problem is when Coffee does not flow from the coffee machine, familiar to many owners as budget De’Longhi Magnifica, and bonus Jura E8. In 80% of cases, the malfunction can be fixed on your own without calling a technician - just understand the root cause.

This article is not about shamanism with tapping on the body (although this method sometimes works!). We'll sort it out technical reasons - from a simple blockage in the group head to wear on the pump, - and we will also provide checklists for diagnostics and step-by-step instructions. We will pay special attention models with the system Thermoblock, where blockages occur 3 times more often due to the specific nature of water heating. If your machine shows an error on the display (for example, E05 at Saeco), you will also find a solution here.

1. Clogged group head or filter

The most common reason is coffee grounds or limescale block the path of water. In 60% of cases, the problem is solved by cleaning without disassembling. Symptoms:

• 🔹 Water drips in a thin stream or does not flow at all
• 🔹 The machine buzzes longer than usual before dispensing coffee
• 🔹 The “Clean” indicator lights up on the display (at Krups, Melitta)

How to check? Remove portafilter (coffee holder) and start dispensing water without coffee - if the flow is normal, the problem is that the filter is clogged or the grind is too fine. If water does not flow even without a portafilter, there is a blockage in the group head or tubes.

For deep cleaning, use special tablets (for example, Cafiza) or citric acid solution (20 g per 1 liter of water). Don't use vinegar — it corrodes rubber seals! Pour the solution into the reservoir and start the cleaning cycle (most machines have an option in the menu Descale).

What to do if there is a blockage in the pipe?

If water does not flow even after cleaning the head, the problem may be silicone tubeconnecting the pump and the group head. To clean it, you will need to partially disassemble the case. In models Gaggia Classic and Rancilio Silvia The tube is accessible after removing the top cover (2 screws at the back). Blow it out with a compressor or rinse it under high pressure water.

2. Malfunction of the pump (pump)

If the car buzzes, but no water comes out, the pump is at fault. In models with vibration pump (for example, De’Longhi Dedica) it fails more often than in rotary ones (like Jura Z6). Signs of damage:

• 🔧 The machine turns on, but does not pump water
• 🔧 A grinding or knocking sound is heard during operation
• 🔧 There is an error on the display E01 or E02 (y Saeco)

To diagnose, turn off the machine, drain the water from the system and check:

1. Connecting the pump to the control board (contacts often oxidize).
2. Integrity check valve - if it is jammed, water does not flow into the group head.
3. Voltage on the pump with a multimeter (should be 12–24 V depending on the model).

The average cost of a new pump is from 1,500 to 4,000 rubles. To replace, you will need a soldering iron (to disconnect the wires) and a fitting wrench. B Jura and Miele pumps are often assembled with a thermoblock - in this case it is cheaper to send the car for service.

3. Problems with the thermoblock or boiler

In cars with Thermoblock (for example, Lelit Anna) water is heated as it passes through a spiral heater. If the coffee comes out cold or not at all, possible:

• 🔥 The heating element is clogged with scale
• 🔥 Thermostat failure (the machine does not heat the water)
• 🔥 Broken spiral in the thermoblock

To check:

1. Start the hot water supply (without coffee). If it's cold, the problem is heating.
2. Check the heater resistance with a multimeter (should be 20–60 ohms).
3. Inspect safety thermostat - When overheated, it opens the circuit.

Symptom	Probable Cause	Remedy
The water is cold	Thermoblock clogged with scale	Washing with citric acid or Durgol
The machine turns off after 5–10 seconds	Thermal protection is triggered	Replacing the thermostat or cleaning contacts
Error is on HEAT	Broken spiral in the thermoblock	Replacement of the thermoblock (from RUB 3,000)

In models with double boiler (for example, Rancilio Classe 7) Separately check the switching valve between steam and water. If it is jammed, the machine may “think” it is heating steam and not dispense water for coffee.

4. Assembly errors or wear of seals

If the car stopped leaking after disassembly (for example, for cleaning), assembly errors are likely:

• 🛠 The portafilter or its O-ring is not installed correctly
• 🛠 The silicone tube was pinched when assembling the case
• 🛠 The fittings on the thermoblock are not tightened (there is a leak inside the machine)

Also wear out over time:

• 🛠 Group head o-ring (change every 1–2 years)
• 🛠 Pressure relief valve (if the machine spits coffee)
• 🛠 Pump gaskets (water leaking from under the bottom)

To check for leaks:

1. Start the water supply without the portafilter.
2. Inspect all connections for leaks.
3. Check pressure gauge (should be 9–15 bar).

5. Electronic failures and software errors

Modern machines (eg. Jura E8 or Miele CM6) are controlled by microprocessors. If display shows error (E03, F08), but mechanically everything is fine, the problem is in the “brains”:

• 💻 Firmware crash after power surge
• 💻 Oxidation of contacts on the control board
• 💻 Pressure or temperature sensor malfunction

First steps:

1. Unplug the machine for 10 minutes (reset).
2. Check the error code in the instructions - have Saeco and Philips there are transcripts.
3. Update the firmware via USB (files are downloaded from the manufacturer’s website).

For models with touch controls (such as Smeg ECF01) check the calibration of the sensors. In the service settings menu (access by holding the buttons Power + Coffee) there is an option Sensor Reset.

6. Plumbing or tank problems

If the machine is connected to a water supply (BWT or Brita systems), check:

• 💧 Water pressure (should be 1–3 bar)
• 💧 Coarse filter (clogged with rust)
• 💧 Check valve at the entrance to the car

For machines with reservoir:

• 💧 Make sure that float sensor not stuck (a common problem with De’Longhi).
• 💧 Check it out intake valve at the bottom of the tank - it may become clogged with scale.
• 💧 Use only filtered water — hard water kills a car within 6 months.

If water from the reservoir is not flowing into the system, try:

1. Remove the tank and blow out the water supply fitting.
2. Rinse intake filter (mesh at the bottom of the tank).
3. Check water level tube — if it is bent, the sensor will show “empty tank”.

7. Prevention: how to avoid breakdowns

To make your car last longer than 5 years (the average lifespan of budget models), follow the rules:

• 🛡 Clean the group head every day (just rinse with water after use).
• 🛡 Change the water filter every 2-3 months (or after 100 liters of water).
• 🛡 Use coffee medium grind — too small a filter clogs the filter; too large a filter is not extracted.
• 🛡 Once a week, run the cleaning cycle without coffee (optional Rinse in the menu).

For models with Thermoblock (Lelit, Profitec) critical:

• 🔥 Do not use distilled water - it causes corrosion.
• 🔥 Clean once every six months steam valve (it also becomes clogged with scale).
• 🔥 Do not leave water in the tank overnight - this accelerates the growth of bacteria.

If the machine is used in the office (more than 20 cups per day), check the complete disassembly and cleaning with replacement of all seals. In service centers this service costs from 2,000 rubles.

FAQ: Frequently asked questions

The machine hums, but the coffee doesn’t come out - what should you do first?

1. Unplug the machine and drain the water through the steam valve (if equipped).

2. Remove the portafilter and check if water flows without it. If not, there is a blockage in the group head or tubes.

3. Rinse the head needle with a toothpick and run the cleaning cycle (Descale).

4. If it doesn’t help, check the pump (see section 2).

An error appears on the display E05 (Saeco). What does it mean?

Error E05 points to problem with temperature sensor in the thermoblock. Possible reasons:

• Broken sensor wire (check with a multimeter).
• The thermoblock is clogged with scale (needs cleaning).
• The control board is faulty (diagnostics required).

Try to reset the error: turn off the machine, hold the button Power 10 seconds, then turn on again.

Is it possible to clean a coffee machine with vinegar?

No! Vinegar corrodes rubber seals and leaves a lingering odor. Use:

• Special tablets (Cafiza, Puly Caff).
• Citric acid solution (20 g per 1 liter of water).
• Descaling agents (Durgol, Antinakipin).

After cleaning, be sure to run 2-3 tanks of clean water!

How much does it cost to repair a pump at a service center?

The cost depends on the model and type of pump:

Pump type	Cost of work (rub.)	Cost of spare part (RUB)
Vibrating (De’Longhi)	1 500–2 500	1 200–2 000
Rotary (Jura)	2 500–4 000	3 000–6 000
With thermoblock (Lelit)	3 500–5 000	4 000–8 000

Some services offer exchange for a rebuilt pump - it’s 30–50% cheaper.

How often should the group head O-ring be replaced?

The service life of the ring depends on the intensity of use:

• 🏠 Home use (1-5 cups/day): every 1-2 years.
• ☕ Office/cafe (20+ cups/day): every 3-6 months.

Signs of wear:

• Coffee flows down the sides of the portafilter.
• The machine loses pressure (weak cream).
• The ring shows cracks or deformation.

The cost of the original ring is from 300 to 1,000 rubles (for La Marzocco - up to 2,500 rub.).