The complete absence of liquid in the cup with the working engine of the coffee machine most often indicates a critical clogging of the brewing unit or failure of the pump. If you hear the characteristic hum of the pump, but the jet does not appear, then the water can not overcome the resistance of the compressed coffee tablet or lime plaque inside the hydraulic system. In such cases, automation DeLonghi or Saeco can go into emergency mode to prevent high pressure pipes from rupturing.
Sometimes the problem lies in the banal lack of water supply from the tank, which often happens when the tank is installed incorrectly or the float sensor breaks down. If the machine does not emit any sounds at all and does not try to start the cooking process, then we are talking about an electrical malfunction or a burned-out TEN. In any case, ignoring the symptoms will result in more expensive repairs, so diagnosis should be started immediately after a failure is detected.
Main reasons for lack of water supply
The initial diagnosis always starts with a water supply check, as this is the most vulnerable node of any coffee maker. If the tank is empty or the float is stuck in the lower position, the electronics block the start of the brewing cycle, believing that there is no water. In some models Bosch or Siemens The water level sensor can oxidize by transmitting false signals to the control board.
The second common cause is suffocation of the system, which occurs after prolonged downtime or replacement of filters. The air plug prevents the pump from grabbing water and pushing it through the heating element. To eliminate this, it is often necessary to force the system through a hot water or steam mode, if such a function is provided by the design.
The third reason lies in mechanical damage to the pipes inside the housing. Over time, silicone tubes will dry, crack or jump off the connections under the influence of temperature. In this case, water can circulate inside the machine, pouring a pallet or internal components, but not reaching the nozzle. Visual inspection of internal highways often reveals leakage sites that are easily eliminated by replacing seals.
- 🚫 Clogging of the water intake mesh from the tank with pile or garbage.
- 🚫 Failure of the electromagnetic water supply valve.
- 🚫 The controller's software failure.
- 🚫 Critical decrease in pump performance.
Check if the silicone hose inside the water tank is twisted, as this is a common reason for the lack of supply after washing the tank.
Problems with the brewing block and grinding
If water enters the system, but the coffee is not poured, then the path of the liquid is blocked by a too dense coffee tablet. This happens when the user sets an excessively small milling At the millstone regulator. Pressure in the system increases dramatically, and the pump is physically unable to push water through the compressed powder, which is often accompanied by a crackling or buzzing.
The brewing unit can also be contaminated with old coffee oils, which turn into a solid substance that blocks filters. Regular cleaning of this unit is mandatory, especially in cars. Nespresso or KrupsWhere the block is removable. If the filter cells are clogged, the water simply cannot pass through the tablet, and the cooking cycle will be interrupted or the water will flow around.
⚠️ Warning: Never try to adjust the degree of grinding on a working coffee grinder. The regulator should be rotated only with rotating millstones, otherwise you can break the drive mechanism.
Sometimes the cause is wear of the sealing rings on the brewing block. The rubber bands sank and stop sealing the brewing chamber, which causes water to drain or pallet instead of passing through the coffee. Replacement of seals is a standard maintenance procedure that can be performed independently if there is a remplekt.
Scaling and hydraulic obstacles
Scaling is the main enemy of any technology that works with water, and coffee machines are no exception. Calcium salt deposits narrow the diameter of the tubes and holes in the boiler, creating a critical resistance to flow. When the scale layer becomes too thick, water stops flowing into the brewing chamber, although the pump works at its limit.
The decalcination process should be carried out strictly according to the manufacturer's instructions, using special liquids, not citric acid, which can damage the aluminum elements of the heater. In models Philips and Jura There are automatic washing programs that help remove fresh deposits. If the machine has not been serviced for a long time, mechanical cleaning or even replacement of the boiler may be required.
The table below shows the effect of scale on the operation of various nodes of the coffee machine:
| System node | Symptoms of pollution | Consequence | Method of decision |
|---|---|---|---|
| TEN/Boiler | Heat noise, long start. | Overheating and breakdown | Chemical decalcination |
| Feed valve | Drip in the pallet | System leakage | Valve replacement |
| Hydrosystem | Weak jet pressure | Uncooked coffee | Pressure washing |
| Flow sensor | No water mistake | Blocking of work | Cleaning or replacing the sensor |
Regular use of filtered water prolongs the life of the coffee machine by 2-3 times and prevents the formation of plugs from scale.
Failure of the pump and electrical part
The vibration pump is the heart of the coffee machine, creating the required pressure of 9-15 bar. Over time, her performance drops and she stops pumping water through coffee. If the pump is buzzing when you turn on the preparation, but there is no water, the membranes may have worn out or the engine winding burned. In some cases, it helps to adjust the pressure screw, if it is provided by the design.
Electromagnetic valves control the direction of water flows: into the boiler, into the brewing block or into the bypass channel. If one of the valves jams in the closed position, the water will not physically be able to pass beyond a certain section of the highway. Diagnosis is carried out by vertebrating the coils of valves with a multimeter for a break or short circuit.
The control board can also cause a feed stop if the pump control simistors are burned or pressure sensors fail. In modern models Gaggia or Delonghi Magnifica The error is often displayed as code. Decoding the error code allows you to accurately determine the burned component without deep disassembly.
- 🔌 Check the voltage on the pump contacts at start.
- 🔌 Integrity of pump winding.
- 🔌 Visual inspection of the board for the presence of swollen capacitors.
- 🔌 Check the contacts of the tips of the brewing block.
Specificity of different types of coffee machines
Capsule coffee machines, such as Nespresso or Dolce GustoThey have their own characteristics. They do not have a classic brewing unit, and the puncture of the capsule and the water supply depend on the condition of the needle and pump. If the needle is blunt or bent, it will not be able to penetrate the capsule and the water will not go. Also in such machines often clogged the exit hole due to the residue of coffee from previous cycles.
Carbon coffee makers (espresso machines) require proper tempering of the coffee. If the user has too much rammed the coffee in the cone, the resistance will be too high for the regular pump. In this case, the water will either not go at all, or it will drip a drop. The solution is to reduce the pressing force or use larger grinding coffee.
The Secret to the Perfect Espresso
Strait time is 25-30 seconds. If the water pours faster - grinding large, if slower or dripping - small.
Automatic coffee machines with ceramic millstones are less sensitive to overheating, but more fragile when stones get into the grain. If the millstones are broken, the coffee will not be ground, and the machine will give the error "End of grain" or simply will not start grinding, respectively, and the coffee will not be poured.
☑️ Diagnostics before the Master's call
Prevention and operation rules
That the problem of "why the machine doesn't pour coffee" hasn't bothered you for years, you need to follow simple rules of operation. Regular decalcination and washing of the brewing unit are basic procedures that take 10-15 minutes a week. The use of quality water and fresh grains without impurities also significantly reduces the load on hydraulics.
Do not leave the car on overnight unnecessarily, as constant heating cycles accelerate scale formation. If you are away for a few days, it is better to drain the water from the tank and turn off the device from the network. This will save the pump and TENG resources.
⚠️ Note: The use of distilled water in some coffee machines is prohibited, as flow sensors may not work due to the lack of mineral salts conducting current.
Timely replacement of softeners (if provided by the model, for example, in the Brita For coffee machines, you can forget about scale for six months. Ignoring the filter replacement causes it to become a source of contamination and bacteria.
Frequently Asked Questions (FAQ)
Why is the coffee machine buzzing, but the coffee is not pouring?
The buzz indicates the pump is working. Most likely, an air traffic jam formed, the brewing block clogged due to too fine grinding or the pump failed, which does not create the necessary pressure. Try to make a idle water without coffee.
What to do if the scale indicator is burning?
It is necessary to conduct a decalcination procedure with a special means. If the indicator does not go out after the procedure, the flow sensor may be defective or a cycle counter reset via the service menu is required.
Can I use citric acid for cleaning?
Manufacturers do not recommend citric acid, as it can damage aluminum boiler alloys and rubber seals. It is better to use special means based on lactic or sulfamic acids.
How do you know if the pump is burned?
If there is no characteristic sound of the pump when the cooking mode is turned on, but the machine turns on and the display burns, check the voltage on the pump contacts. If the current is going, and there is no buzzing, the pump is burned and needs to be replaced.