Why does the pressure on my combi boiler keep dropping?
Your combi boiler can be losing pressure for a number of reasons. Pressure loss may be caused from a leak in the pressure relief valve, an issue in the expansion vessel, air in your system, or a leak in the heating pipework itself.
Can boiler pressure drop without a leak?
If your boiler maintains pressure after this, then it is likely that the problem has been solved. If your boiler continues losing pressure and there is no leak, then there may be a fault with the boiler.
How do I know if my expansion vessel is faulty?
If water comes out of the valve you have a definite expansion vessel fault. In this case the vessel has definitely failed and must be replaced. If no water comes out but no air either, you have an expansion vessel fault but the diaphragm may still be intact and it may be possible to re-pressurise.
Can a faulty expansion vessel cause pressure loss?
3-You have a faulty expansion vessel When the system cools down you will find the water lost will now show on the pressure gauge as a significant drop. Very similar to the above scenarios, as if the system has a leak and will also cause the boiler to lock out and break down once cooled.
What would cause a pressure relief valve to leak?
Pressure relief and safety relief valves will leak if the valve isn’t fully closed. This is a common problem in industrial settings where environments are often dusty or dirty. If there is any debris in the valve, it can obstruct the valve from fully closing, causing it to leak.
Is it normal for boiler pressure to drop?
Does boiler pressure keep dropping? Your boiler losing pressure is an occurrence more natural than childbirth, and overtime (or, sometimes overnight) – they’re bound to lose some water (pressure) and require topping up (or, repressurised). So if this is your boilers first rodeo – relax.
Does bleeding a radiator reduce boiler pressure?
If you bled your radiators recently, you may have lost some pressure. That’s because, when you bleed a radiator, air is released, which lowers the pressure in your boiler system.
How do I find a leak in my heating system?
Visually inspect underneath and around the boiler The most obvious sign of a central heating leak is dripping around the boiler itself. Thoroughly check the boiler for any signs of water damage, being careful not to check pipes when they are hot and check all the boiler’s fittings.
Why does my ferroli boiler keep losing pressure?
Ferroli Boiler Pressure Loss Leaks are the most common cause of any boiler losing system water pressure. Most of the time the leak will occur on radiator valves, or valves on towel rails. However, the leak can sometimes come from the auto air vent in the boiler, or expansion vessel.
How do you know if pressure relief valve is leaking?
The water will often evaporate before it can be noticed on the ground, but brown rust or lime-scale stains are a good indication it has been leaking. It is quite simple to test is the PRV is leaking, however if you have any doubts you should consult an engineer.