What to do if the pressure in the heating system is low

The heating system of a home without the required pressure indicator will not work correctly. In addition, pressure losses and pressure drops negatively affect the functioning of the equipment and lead to breakdowns. When the pressure in the heating system drops, then the causes that caused these surges should be immediately eliminated.

Important! Pressure surges in the system are due to the difference in the area of ​​return and supply.

System pressure

Causes that lead to pressure drops

Pressure in a closed system can rise or fall sharply due to interruptions in the operation of the boiler or water leaks in the pipeline and heating devices.

Leak detection methods

If the communications of the heating system are laid in an open way, then it is easy to find out why the pressure has dropped. It is necessary to check the level of tightness of all connections, and how well the pipeline is installed. Puddles of water under a pipe or radiator are a cause for concern. Probably, in this place the leak occurs, because of it, pressure losses occur. Sometimes there is no water, it can evaporate, but traces of it remain on the floor. And this is also credited to the signs of a leak. They lead to the loss of pressure.

Especially carefully it is necessary to inspect the places of the sectional joints of the radiators for the presence of manifestations of corrosion. Rusty smudges on the surface of the battery indicate damage. This also leads to the loss of pressure.

Determining why the pressure dropped on pipes laid in a hidden way is much more difficult. There is no safer option than to seek help from specialists who have special equipment. When checking, you need to completely drain the water from the network, shut off the boilers and radiators, and pump air with a compressor. It whistles out in those places where the connections have weakened and microcracks have formed, which cause a loss of pressure.

After found damage, repairs should be carried out:

1. Cut or replace part of the pipe;
2. Tighten the connection that is loose;
3. Roll up with a sealing tape;
4. Replace the broken system node.

Important! It is better to hire an experienced plumber to repair the heating system. There is no guarantee that after a repair carried out by an amateur master, you will not have to repair everything again.

Checking the health of the heating boiler

If there are no problems in the network, and the pressure drop continues, then it is worth checking the boiler equipment. It can only be serviced by a specialist who has the appropriate education. If there is no pressure, or it supplies constantly, but not abruptly, then it is necessary to periodically recharge the system. Problems can arise from small cracks in the boiler heat exchanger. They appear due to a factory defect, due to water hammer, breakdown of the make-up valve, etc.
Heating system adaptation time after start-up:

1. You should be aware that the pressure in the heating system, which has just been started, drops constantly, this is the norm. Don't worry about this. These drops are caused by the air dissolved in the coolant, which comes out gradually in automatic mode, or you can release it from the radiators manually. After that, you need to add water to the network, at first you need to do this, but this way you can increase the level to normal indicators;
2. If, after the equipment was started, four weeks have passed, and the pressure disappears, or there is no pressure at all, then the problems may be hidden in the wrong choice of the expansion tank volume. If this is the case, then the safety valve is triggered and water is discharged, and when the heating device cools down, a drop in performance occurs. In such circumstances, to increase the pressure, the expansion tank must be changed;
3. If the volume of the tank meets the parameters of the heating system, then problems with a drop in water pressure may arise due to the fact that the network is depressurized. Eliminating water leaks in a heating device helps to solve the problem of pressure drop.