Boiler Losing Pressure No Leak

Most times, loss of pressure in a boiler is as a result of a leak. However, in some cases, your boiler might be losing pressure but, it doesn’t have a leak.

If this happens to be the case, then there is a list of problems you can check that will point you to what could be causing the loss of pressure. In most cases, it is best to leave this kind of work to the professionals. You can get in touch with us today and we will have a qualified engineer at your door in no time.

Faulty Pressure Relief Valve

Ideally, the boiler should operate between 1 bar to 1.5 bar. If there are problems with the boiler, it can go as high as 3 bar. The pressure release valve should notice this problem and open to release the extra pressure. If this valve fails, it can cause the boiler to lose more pressure.

Auto Air Vents

Over the years, your central heating can collect air pockets. To get rid of this air pockets, you can vent the radiators. The new combi boilers also come fitted with auto air vents that help to resolve the same problem. The auto air vents are usually on the inside casing of the boiler.

See Also: Boiler Making Noise When Switched Off

If the vent is faulty, it can cause the boiler to lose pressure. If you suspect this could be the problem, it is important that you let a trained and qualified person look at it for you.

Air in the Radiators

This usually happens after the central heating has been serviced. Air might have collected in the towel rails and the radiator. To fix this, you can use the bleeding key. All you need to do is open the vent slightly using the key. As soon as the air starts coming out, you will hear a hissing sound.

This needs to be done for every other radiator and towel rail in the house. While doing this, you might want to have a rug or towel to collect the water and avoid damage to the carpet.

Faulty Expansion Vessel

Another area of concern you need to consider when looking into why your boiler is losing pressure without leaking is the expansion vessel. The vessel needs to be re-pressurised every once in a while. If it is not, it could affect the pressure of the boiler.

Another cause of loss of pressure with regards to the expansion vessel is a faulty Schraeder valve which could be leaking causing loss of pressure. If you re-pressurise the expansion vessel and that does not take care of the issue, the next practical solution is to replace the valve.

Faulty Pressure Gauge

It is possible that your boiler is not losing pressure at all. Your pressure gauge could be faulty and giving you the wrong readings. As absurd as this might sound, it happens to be the case quite often. If all of these checks don’t identify the problem, then it could be the pressure gauge that is faulty.

It can be frustrating trying to understand why your boiler is losing water. With our experience and training, we can make the process of troubleshooting easier and more fruitful. We can also help carry out the necessary processes to resolve the problem.

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