Why Does the Boiler Pressure Rise
Why Does the Boiler Pressure Rise

Why Does the Boiler Pressure Rise ?

Why Does the Boiler Pressure Rise ? Combi boilers, which are used to meet the heating and hot water needs of many houses , sometimes face various malfunctions and problems. One of the most common failure situations in natural gas combi boilers is the sudden increase in the pressure of the combi boiler or the bar. Combi pressure rise is a problem that many combi boiler users encounter and frequently sought for a solution. So why does the boiler pressure increase ? What should be done to reduce the boiler pressure? The answers to all these questions and more are waiting for you in our article!

Why Does the Combi Bar Raise?

Why Does the Boiler Pressure Rise ? The question of why the combi pressure and the combi bar rise is among the questions most frequently asked by combi boiler users. There can be many different reasons for the combi bar to rise. In order to find the root cause, you should consider all the factors and make sure that these problems exist in the boiler.

What Can Be the Causes of Combi Pressure Rise?

  • If the boiler pressure is rising , one of the possible reasons is that the filling tap is left open. That’s why you should check the boiler filling tap and make sure that it is closed. To close the boiler filling tap, it must be tightened well, but care must be taken not to break it as it is a delicate part.
  • Another possible reason for the boiler pressure rise is that the filling tap is not closing. Even if you are sure that you have closed the combi tap, if there is even a small step left in the tap, the pressure may increase. In order to correct this situation, the faulty filling tap must be replaced with a new one.
  • You may break the part when you turn the faucet strongly to flood the boiler. If the filling tap is broken, the pressure of the boiler will increase. Therefore, if any part of the filling spout is broken, the faucet must be replaced completely.
  • Another answer to the question of why the boiler pressure rises is plate-main exchanger failure. When the plate-main exchanger fails, the boiler pressure rises on its own. If your combi has double heat exchanger, the problem is in the plate heat exchanger; If it is a single heat exchanger, the problem may be in the main heat exchanger.
  • One of the last reasons for the increase in the pressure of the boiler is the lack of air in the expansion tank or the hole in the membrane. Especially in combi boilers that are not regularly maintained, the air of the expansion tank cannot be controlled and problems such as pressure rise may occur when the air is depleted. In order to make sure that such a problem is experienced, you should check the air of the expansion tank, if there is no air, you should press air. If the membrane of the expansion tank is perforated, replacement is necessary.

What Should The Combi Pressure Be?

It is extremely important to adjust the water pressure in the boiler correctly. The pressure of the boiler should neither be too high nor too low. The most correct answer to the question of what the boiler pressure should be will be between 1.5 and 2 bar. If the boiler pressure is below 1.5, the water sent to the taps or the entire installation may not be at the desired temperature. If the boiler pressure rises more than necessary, that is, if it rises above 2.5 bar; The boiler’s security system is activated. In this case, it starts to drain the water from the discharge valve under the boiler.

If the Combi Pressure Increases from 1.5 Bar to 2 Bar

The increase in the pressure of the boiler from 1.5 bar to 2 bar is not a malfunction. Combi boilers boil the water in them when the heaters are turned on, that is, when the winter mode is switched on, and the water increases as it boils. Therefore, there may be slight increases in the pressure value. If you set the pressure value to 1.5 bar, but the value goes up to 2 bar, you don’t need to worry because this is not a problem.

If Boiler Pressure Is Constantly Rising Above 3 Bar

The question of what happens if the boiler pressure is 3 bar is one of the most curious questions of those who have the problem of increasing the boiler pressure. If the boiler pressure rises above 3 bar, it is possible to say that there is a problem here. After the pressure of the boiler exceeds 3 bar, the device has to discharge the excess water with the safety valve. In this case, the safety valve opens and starts to discharge the water in the combi boiler, then the combi water flows. One of the possible answers to the question of why the boiler leaks water is this reason.

Is Boiler Pressure Rise Dangerous?

When the pressure gauge showing the boiler pressure rises to 3 bar, the boilers usually start to leak water. In this case, the water leaking from the safety valve does not mean that there is a malfunction in the safety valve; means the boiler pressure is high. When the boiler pressure rises and the boiler starts to flow water, the water level of the boiler must be lowered. Otherwise, an increase in the water level may cause water leakage and other problems. If the water pressure does not decrease and continues to rise, it can lead to situations that lead to the failure of the boiler.

Pressure Increases While Combi Boiler Is Working, What Should I Do?

If the pressure rises while the boiler is operating , you must first find the root cause of the pressure rise. As we mentioned above, more than one answer can be given to the question of why the boiler pressure is rising. For this, you can examine the possible reasons we listed at the beginning of the article and determine what caused the problem. You can solve some of the problems that cause pressure rise in the boiler yourself.

If the pressure of your boiler is high, you, as the user, can first check the filling tap. You may have left the faucet on while you were pumping water into the combi. Therefore, you should look at the filling tap and close it if it is open. (The fill cock is usually closed by turning it to the right.)

Why Does the Boiler Pressure Rise ? One of the most common reasons for the boiler pressure rise is too much water in the boiler. As the heated water expands, it compresses the air in the system and causes the pressure to rise. When small pressure increases occur in your combi, you can first try to reduce the pressure by using the discharge hose under your combi. In addition to this method, you can also reduce the pressure by using the main discharge tap of the installation or the discharge switch on your heater cores. There is usually a main drain tap in one of the wet areas such as the kitchen, bathroom or balcony. By opening this faucet, you can drain excess water until your boiler pressure returns to normal. When your boiler reaches 1.5-2 bar pressure, you can complete the process by tightening the main drain tap or the burner again.

If the water pressure of your combi is constantly decreasing and you have to constantly flood the combi, or if the pressure is constantly increasing and you have to reduce the pressure constantly, then there may be a different malfunction in the device. When you experience such a situation, you should definitely get help from the technical service.

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