The coffee machine does not pour enough coffee: reasons and solutions

If the coffee machine pours little coffee, in most cases the problem lies in the settings for the portion volume being incorrect or the brewing unit being clogged with remnants of ground beans. This is a common symptom that is often mistaken for a pump or heater failure, although in practice it only requires correct calibration or simple cleaning. Understanding exactly how the water dosing mechanism works allows you to quickly diagnose the problem and return the device to its previous performance without contacting a service center.

A decrease in the volume of the finished drink can be caused by a change in the density of the coffee tamper, which creates excessive resistance to the flow of hot water. In automatic models, the volume sensor sometimes reads incorrectly due to scale or air pockets in the hydraulic system. It is important to immediately determine whether the volume of liquid espresso has decreased or whether the coffee tablet itself has become too dry and crumbly, since these symptoms indicate different components of the unit.

The main reasons for reducing the volume of the drink

The first and most obvious reason why the device dispenses less liquid is a failure in the software responsible for timing the pump. Modern coffee machines DeLonghi, Saeco or Bosch a time interval or pump revolution counter is often used to determine volume, and any failure in this data will result in underfilling. The user may have accidentally changed the settings in the menu, setting a smaller cup volume, or a power surge may have occurred, resetting the settings to factory settings, which do not always meet the owner’s expectations.

The second critical factor is the condition of the water supply routes and the presence of air pockets. If an air pocket has formed in the system, the pump begins to circulate air, and the actual amount of water passing through the coffee is significantly reduced. It is also worth paying attention to the water softener filter: if it has not been changed for a long time or has dried out, it creates additional resistance, which is why the water barely drips or flows in a thin stream, not having time to collect the required volume in the allotted time.

The third group of reasons is related to the quality and degree of grinding of the grains. Grinding too fine creates a “clogging” effect, where water physically cannot pass through the compressed coffee in the required amount. As a result, the coffee machine hums, trying to push water, but the output is only a few milliliters of thick, over-extracted liquid. In such cases, the overload protection often trips and the cooking cycle is interrupted prematurely.

Diagnostics of serving volume settings

Before disassembling the device, it is necessary to eliminate software errors by checking the current cooking parameters. The menu of most devices has a volume programming function, which allows you to set the number of milliliters for each button. If the coffee machine starts pouring less, perhaps one of the family members accidentally reprogrammed the button or the settings were lost after decalcification.

To check, you need to enter the setup mode, usually this is done by long-pressing the cooking button or through the service menu. It is important to carefully study the parameters here water volume and duration of submission. If the numbers differ from the usual values, they need to be adjusted. Some models require calibration after each cleaning, as they “forget” user preferences.

It is also worth checking whether the energy saving mode or “quiet mode” is activated, which may limit the pump’s power and, as a result, the volume of water supplied. In the instructions for the models Krups or Philips It is often mentioned that after the descaling procedure, the device automatically goes into rinsing mode, where volumes may be limited.

Problems with the brewing unit and grinding

The brewing unit (Brewing Unit) is the heart of the coffee machine, and it is here that mechanical obstacles to the normal flow of water most often arise. If the grinder is set too fine, the ground coffee turns into dust, which when in contact with water forms a dense mass that resembles clay. Water cannot pass through such an obstacle, and the pressure in the system increases sharply, which leads to a decrease in the yield of the finished product.

Adjusting the burrs of a coffee grinder is a delicate process that requires caution. You can turn the regulator only when the millstones are in motion, otherwise there is a risk of damaging the mechanism. If you notice that the coffee tablet that comes out is too dry and crumbly, or, on the contrary, is a monolithic pancake that is difficult to knock out, then the degree of pomoz has been chosen incorrectly.

Another reason is wear of the O-rings on the brewing unit. Over time, the rubber bands lose their elasticity and begin to let water past the coffee tablet. As a result, some of the water goes into the waste compartment and less drink ends up in the cup. This can be seen visually if you look into the pulp container: it may be too wet or filled with water.

⚠️ Attention: Never adjust the grind level while the coffee grinder is running without load (without beans), this can lead to breakage of the burrs. It is also prohibited to turn the regulator when the mechanism is stopped.

Blockages in the hydraulic system and puncture needle

Scale and coffee oils are the main enemies of hydraulics. Even if you regularly use filtered water, over time deposits form in the pipes and boiler, which narrow the flow area. The capsule piercing needle or the water supply spout in carob coffee makers are especially affected. If the hole is clogged, water simply will not be able to pass through in the required volume.

For diagnostics, you should inspect the brewing group and water supply channels. Often, fossils of coffee dust accumulate in the distribution grid from which water flows onto the coffee. They can be carefully removed with a thin knitting needle or a special brush. In automatic machines, it is worth checking the mesh filter at the water inlet to the pump, which can also be clogged with rust or sand from the water supply.

The descaling procedure helps dissolve mineral deposits, but it will not remove coffee oils. For this purpose, there are special chemicals that break down the fatty film. If you ignore cleaning, the layer of oils will grow, and the throughput of the system will drop every month until the coffee drips drop by drop.

Malfunctions of the pump and pressure sensors

If the software settings are fine, but cleaning does not produce results, the problem may lie in technical components. The pump creates the necessary pressure for water to pass through the coffee. Over time, the pump's performance decreases; it begins to hum louder than usual, but pumps weaker. In this case, the water simply does not have time to gain the required volume during the standard cycle time.

The pressure sensor also plays a key role. If it transmits incorrect data to the control board, the electronics may prematurely stop the water supply, “thinking” that the pressure has already reached its maximum or, conversely, has dropped to a critical level. In models with vibration pumps, the valve that regulates the release of excess pressure often fails.

An air lock is another frequent guest in the system, especially after a long period of inactivity or filter replacement. Air compresses in the system more easily than water and interferes with the normal flow of fluid. To eliminate this problem, it is necessary to carry out the procedure of pumping the system: start the supply of hot water or steam several times in a row until a smooth, bubbling stream without spitting comes out of the spout.

Troubleshooting instructions

To fix the problem yourself, it is recommended to act consistently, starting with the simplest steps. First, remove the brewing unit (if the design allows) and wash it with warm water without detergents. Make sure the screens are clean and the seals are intact. Lubricate the moving parts with silicone grease if recommended by your device manufacturer.

Next, perform complete decalcification using a quality product. Pour the solution into the tank, start the cleaning mode and wait until the cycle ends. After this, be sure to rinse the system with clean water, running 2-3 tanks through the machine to remove any remaining chemicals. This will help restore patency of the tubes.

If the problem is not resolved, proceed to the grind settings. Turn the dial one notch toward the coarser grain (usually toward the larger numbers or the coarse grain icon). Prepare several cups, as the grind change takes effect only after the new beans in the millstone have been ground.

Prevention and proper care

To ensure that your coffee machine does not cause problems with the coffee machine's dispensing volume in the future, it is important to maintain a regular maintenance schedule. Daily rinsing brewing unit and tray will prevent the accumulation of coffee oils. Once a week, it is recommended to carry out deep cleaning using special tablets that dissolve fatty deposits inside the system.

Do not forget to change softener filters according to the service life specified by the manufacturer. An expired filter not only purifies water worse, but also becomes a source of pollution, releasing accumulated dirt back into the system. It is also worth periodically checking the condition of the grains: the presence of foreign objects or an excessively oily surface can negatively affect the operation of the millstones.

If you notice that the machine is starting to get louder, get hotter, or make strange noises when cooking, don't wait until it stops completely. Early diagnosis helps avoid costly repairs. Regular maintenance is the key to maintaining stable pressure and the ideal volume for your morning cup of coffee.