Boiler Pressure Keeps Dropping to 0

Unfortunately, boilers losing pressure is a common problem especially in systems that are not properly maintained.

Boilers that are part of a sealed system require pressure (about 1.5bar) to function. To accumulate pressure, the heating circuit is sealed after the system is filled with water to a certain level. If water escapes from the system, the pressure reduces. If the pressure falls below 0.75 bar, the safety switch prevents the boiler from firing. This means no more hot water for you.

What Causes Loss of Pressure in Boiler?

There are several reasons why your boiler might be losing pressure. Regardless of what the reason could be, it should only be corrected by a qualified person.

Leaks

The most common reason for pressure loss is leaking. The leak can be anywhere in the central heating circuit and identifying the source of the leaks can be difficult at times.

See Also: Boiler Losing Pressure No Leak

If you get in touch with us at 2 RED, our technician will take time to locate the leak. We don’t mind get on our hands and knees, feeling the pipework and the radiator and in tight spaces to find the leak. It is important to note that even the smallest leak can have a huge impact on the pressure level. Also, if the leak is not repaired, it only gets worse over time.

Burst or Discharged Expansion Vessel

Once water is heated, it expands. This increases pressure within the system. The expansion vessel is designed to accommodate the increase in pressure and prevent undue stress on the rest of the system.

The design of the expansion vessel includes a balloon that is pre-charged to 1 bar. In the course of time, the balloon loses the charge. This is easily corrected during the annual boiler service. If the balloon is allowed to lose all of its charges, it can burst which results in costly repairs and increased pressure in the boiler.

It is important for the expansion vessel to be kept functioning properly to allow for proper regulation of pressure. Get in touch with us today for proper boiler servicing and also to recharge your expansion vessel.

Faulty Safety or Pressure Relief Valve

In most cases, the failure of the safety valve or pressure relief valve is because of over pressurisation caused by the failure of the expansion vessel.

The safety valve Is designed to open automatically every time the pressure reaches 3 bar. Eventually, the valve might not close because debris from the system obstructing the valve. If the valve does not close properly, it can leak or weep to cause a pressure drop.

We can help correct the problem during boiler service by replacing the valve.

If you’re concerned about your boiler losing pressure, it could be because you don’t give it enough attention during servicing. For comprehensive and competitive boiler repair, get in touch with us today. We can guarantee an all-round check-up for your boiler and make sure that all the parts of your boiler receive the attention they need to keep working longer and more efficiently.

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