Knowledge base

The heating industry is full of many concepts and cases that can keep you awake at night. We are talking about people who work in them, but above all about users who are provided with various types of heating devices by this industry. With this in mind, we have developed a knowledge base that can be of great help in case of any problems with the device. Because it was developed based on many years of experience of our website. You can find there, among others FAQ - a collection of the most common cases that our service technicians have encountered so far. It is worth mentioning that most of them are among those that can be solved by the user with the appropriate instruction. In addition, our knowledge base includes an intuitive dictionary with all the professional terms related to our heating devices.


Below you will find the most frequently asked questions. We hope you find them helpful in solving your problem. Otherwise, please contact the nearest service technician or our service center

There can be many reasons for this:

  • no fuel in a silo
  • blockade of fuel in feeding augers
  • damaged igniter
  • dirty photodiode
  • slag in the firebox

The flame value should be in the range of 70-100%.


The recommended angle of the pellet feeder is in the range of 30-55 degrees.

It should be performed each time you change pellets or start new batch. Before starting the feeder test:

  • turn off the boiler
  • make sure the hopper is full
  • remove the fuel feed pipe from the burner 
  • prepare a bag

A sooty heat exchanger can be a result of too little oxygen or too much pellet being fed in relation to the blowing. Please check whether the entered calorific value of the pellets is correct.

The quality of pellets significantly affects the correct operation of the boiler. Poor quality, it is able to clog the vent holes in the burner, cause scale or coals, which may result in a small flame, flashback , filling the burner with pellets.

The return temperature should be 55 degrees, and the supply may differ by 5 degrees from the preset boiler temperature.

This situation may take place when:

  • Thermostat has not been selected. In order to slect thermostat, please follow below instrujctions:
    1.  Menu
    2. Service settings
    3. Boiler settings
    4. Thermostat selection
  • There is no synchronization of the ISM - we recommend pair again according to manual
  • The cables connecting the ISM with the module are incorrectly connected

Yes, they are compatible. They perform the appropriate functions when connected to the controller.

Yes, ecoNET300 module is the same for all our controllers, as it is customised, it does not work with devices of different producers.

The return temperature will be shown if we connect the CT4 sensor in the controller as a return according to the given controller connection diagram and attach it to the boiler return.

The reason may be too high airflow at maximum power, which may cause a small flame in the burner. An additional reason may be the lack of periodic inspection of the burner, which may result in clogged openings in the combustion chamber.

It depends on the power of the boiler. When lowering the temperature, however, remember to keep the flame alight.

Low-power boilers (10-50 kW) should be cleaned at least once a year. As for high-power boilers (70-300 kW), they should be cleaned twice a year.

Fresh air is required for the proper operation of the boiler, the burner draws air from the boiler room, for this purpose an aeration grate or the so-called the book.

Picking ash up depends on the amount of pellets stored in the ash pan.


There are terms in the dictionary arranged alphabetically 

  • Agropellet – is a type of renewable solid fuel in the form of granules. Unlike traditional pellets, it is made from agricultural and forestry wastes.
  • Buffer Also known as a buffer tank. There is hot water for heating the building.
  • CO - central heating.
  • DHW - domestic hot water.
  • Burner temperature sensor – temperature probe, located in the burner. Its task is to detect an increase in temperature in the fuel feeding system and activate the alarm of exceeding the allowed temperature.
  • Weather sensor - used to regulate the temperature of the boiler in relation to the temperature outside the building.
  • Cleaning – the regulator enables cleaning of the furnace using the operation of the blower and exhaust fan.
  • The chimney flue is a pipe that connects the boiler with the chimney duct.

Tank disinfection – it is raising the DHW tank temperature to 70 ℃ for a specified period of time in order to kill legionnaires in the domestic water system.

  • Burner screen – it is task is to isolate the combustion chamber from the burner body during pellet combustion.
  • ecoNET 300 – a module that allows you to control the regulator using a website or application.
  • ecoSTER – room thermostat for heating circuit regulators.
  • esterX – wireless room thermostat for heating circuit regulators.


  • Flange assembly – thermal insulation of the outer tube.
  • Photocell – a sensor responsible for detecting the flame by measuring the light intensity in the furnace chamber.
  • FuzzyLogic – an operation mode in which the controller automatically decides about the burner power with which the boiler will operate in order to maintain the boiler temperature at a preset level.

Pump group – previously prepared hydraulic set for supplying the heating circuit. Depending on the variant, it is most often equipped with a circulation pump, thermostatic valve and properly located check and shut-off valves.

  • Work schedule – allows you to control the burner operation within the weekly work schedule. The setpoint is adjusted for each week individually .
  • Boiler hysteresis – it is a parameter that is a difference, e.g. between the preset boiler temperature and the current temperature measured by the boiler temperature sensor. It influences, among others to switch off the circulation pump.

ISM – radio module (transmitter) cooperating with the room regulators of the esterX series . Through it, room regulators connect to the boiler controller.

  • Blow-in chamber (external)  – is responsible for the aeration of the lode along the entire length of the chamber.
  • The furnace chamber (internal) its rotation prevents the slag from sticking to the walls.
  • The calorific value of pellets is a value that determines the amount of heat that can be obtained from the complete combustion of a kilogram of pellets.

  • Test fuel mass – this is the value that is entered into the controller after the feeder test is completed. On its basis, the controller calculates the fuel doses needed for proper combustion.
  • Module A – main controller module.
  • Module B and Module C – extend the functions of Module A.
  • Lambda module –  adjusts the oxygen content during combustion.
  • Supervision – in this mode, the controller maintains the burner operation at a very low power.

Rotation of the chamber – allows for complete combustion of the supplied fuel and prevents the slag from sticking to the walls.

  • The controller panel – touch or with a knob, together with the A module form the controller.
  • Pellets – wood sawdust compressed under pressure in the form of granules. Usually with a diameter of 6 - 8 mm.
  • First running – performed by an authorized service technician - a mandatory condition for receiving the warranty.
  • Feeder – transports pellets from the external container to the burner. 
  • Standstill – this mode means that the boiler is put out and waiting for a signal to start work
  • Operation – mode informing that the burner is working with the set power. Fuel is fed automatically.
  • Burner inspection – should be performed every year.

Firing up – a mode for automatic firing up of the furnace in the boiler.

  • Standard – regulation mode in which the transition to supervision will take place after reaching the preset boiler temperature.
  • STB – temperature sensor. It activates when the critical temperature of 95 ℃ is reached . Disconnects power. To restart, press the button on the housing, located under the black plug.
  • Boiler controller – necessary device for cooperation with the burner.
  • Spiro pipe – element of the fuel feeding system to the burner. It is located between the internal feeder (stoker) and the feeder collecting fuel from the external tank. The pipe is made of a melting material, which, in the event of a flashback from the inside of the burner, prevents the ignition of the fuel in the container.
  • Temp. boiler cooling – after the temperature in a given heating circuit is exceeded, a mechanism will be activated to discharge the heat and prevent overheating of the installation
  • Preset temperature – includes boiler, DHW and mixer temperature settings.
  • Thermostat – a device designed to maintain the set temperature by sending a signal to the main regulator (wired or wireless). To use a wireless thermostat, the ISM radio module must be connected.
  • Regulation mode – responsible for temperature stabilization.


  • Blow-in fan –is responsible for blowing in the ignition, operation and cleaning process, there are 3 power levels in it (minimum, average, maximum).
  • Exhaust fan – supports the operation of the boiler by regulating the chimney draft.
  • Extinguishing – in this mode, the rest of the fuel is burnt.
  • Clean the exchanger – a prompt informing about the need to clean the ash pan.
  • H output – expansion on module A allowing configuration of cleaning the heat exchanger, alarm and reserve boiler control output.
  • Heat exchanger – its task is to exchange heat between two fluids.
  • Igniter – ceramic element of the burner responsible for ignition of pellets with the use of hot air stream.

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