In this article, we explore the various causes that can lead to insufficient circulation in a boiler, a common problem that can significantly compromise the efficiency and operation of the heating system. In addition to the presence of dirt in the radiators, a frequent cause of this problem, it is also important to consider the possibility that the thermostatic valves of the radiators are all closed or blocked.

This situation can create an obstacle to the correct flow of water, causing ineffective circulation. We will also delve into the crucial role of the magnetic separator in preventing dirt accumulation and the issue of a circulator with a dirty propeller. Additionally, we will discuss the differences in diagnosing circulation problems between newer and older boiler models, highlighting how modern technology helps to identify and solve these problems more effectively.

Circulation Problems Caused by Dirt in Radiators

Insufficient circulation in a boiler can be due to the dirt accumulated in the radiators. In the absence of a magnetic separator filter, the dirt can reach the primary exchanger of the boiler, obstructing it and preventing the normal flow of water.

An effective solution to remove dirt from the radiators is to perform a chemical washing of the system. This process, which is recommended after years of operation, especially in cast iron or aluminum systems, requires the use of an external pump and specific washing liquids. It is essential to entrust this operation to expert personnel, as proper cleaning not only frees the radiators and pipes from the accumulation of dirt and debris but also ensures the maintenance of the efficiency and longevity of the heating system.

Algae in Underfloor Heating Systems

Underfloor heating systems, due to their low operating temperatures, can be susceptible to algae formation. These can cause obstructions and reduce the efficiency of the system. A phenomenon that becomes more evident after about 15 years of operation. To solve this problem, it is recommended to wash the system using specific chemical solutions and algicidal products. This cleaning process, which should be carried out under the guidance of expert professionals, is fundamental to maintaining the efficiency and durability of the system, eliminating algae and preventing future formations.

The Importance of the Magnetic Separator

The magnetic separator plays a crucial role in preventing this problem. However, it is important to note that even with the presence of a separator, dirt can accumulate in the filter itself, requiring regular maintenance.

Problems with the Circulator

Another common cause of insufficient circulation is a circulator with a dirty propeller. If the propeller is obstructed, the circulator cannot effectively move water through the system, compromising its functionality.

Diagnosis in New and Old Boiler Models

In newer boiler models, this problem is usually indicated on the display. This is because the modulating pumps communicate to the electronic board the effort they are making to circulate the water. In older models, on the other hand, the lack of circulation can prevent the ignition of the flame, as the pump's flow switch does not give the necessary consent to complete the ignition phases.