Is it normal for a boiler to lose pressure over time?
If you’ve woken up this morning and found your boiler has lost pressure for the first time, don’t panic. It’s a very common occurrence. Over time, or even overnight, your boiler can lose water and therefore pressure. All that’s necessary is to top up the boiler or, in other words, to repressurise the system.
What causes pressure to drop in boiler?
Modern boilers require constant water pressure in order to function properly. There are two main problems that typically cause a loss of pressure – water escaping somewhere in the system or a failure of the expansion valve and resulting damage to the pressure relief valve.
What causes pressure drop in boiler?
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.
What does it mean when your boiler is losing pressure?
99% of the time, a boiler losing pressure is a leak. It’s as simple as that. Unless the dial sits at 0 even when topped up (which could be a sign of a faulty pressure gauge), there’s a leak somewhere – even if you can’t see it. Whether you have an oil, system or combi boiler,…
What to do if you have a leak in your boiler?
Shut all isolation valves on the boiler (underneath and a quarter turn). If the pressure stops falling with the boiler isolated then the leak is on the system (rads, pipe, etc). If the pressure continues to fall then the pressure loss is due to the appliance (refer above).
Why does water run out of the boiler?
Rarely, the heat exchanger in the boiler can leak and it is sometimes obvious if this happening as there will be a pool of water under the boiler. Otherwise, and especially on newer boilers, the water runs out of the condensate pipe that should be passing water in any event.
Why is my central heating system losing pressure?
There is a usually a Schrader valve – like a bicycle tyre valve – on the tank. If the middle of this pushed and water comes out, the diaphragm has ruptured and is probably the cause of the leak. Note that the air in the vessel should be pressurised to about 1 – 1.5 bar