Why is the pressure on my boiler going up?
Combi boiler pressure increases when the heating is on as your boiler uses fuel (gas, oil etc) to heat the water – this increase in pressure is natural. If your boiler is behaving as it should, the pressure will stabilise again once the system is switched off and cooled down.
Why is my new combi boiler losing pressure?
A boiler that keeps losing pressure is therefore always cause for concern. 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 happens if my boiler pressure is too high?
Most boilers will simply shut down via a safety device called a PRV (Pressure Release Valve), or break down when your boiler pressure is too high, for too long. The worst-case scenario for most boilers suffering from high pressure will be a broken boiler and a soaked carpet.
What should the pressure be on a combi boiler?
The pressure of your combi boiler should be between 1 and 1.5 bar when the system is OFF & the water is COLD. It is perfectly normal to see your gauge rise when your heating system is on & the water is hot. If your pressure is less than 1 bar, it’s possible that you have lost water from your system via a leak.
How long does it take to repressurise a combi boiler?
How long does it take to re-pressurise a boiler? Depending on how low the pressure of your boiler is, you should allow water in through the valves for around 10 seconds. This should be enough water to get your combi boiler back up to pressure again. If it takes longer than this, you could have a leak in the system.
When do I need to re pressurise my boiler?
If you’ve noticed that you don’t have any heating or hot water, the problem could be your boiler pressure. If the pressure of your boiler has dropped, you may need to re-pressurise your boiler. You can check the pressure of your boiler and re-pressurise it yourself without having to call-out a Gas Engineer.
Why does a combi boiler have an expansion vessel?
All closed systems (i.e. a combi boiler) have an expansion vessel to allow for excess water levels. In these cases, there is a pipe leading from the regular boiler to the tank. Unfortunately, these pipes can become clogged by dirt and debris, which results in a pressure build up within the system.
When do you need to pressurise a combi boiler?
There isn’t a specific timeframe that states when you should re-pressurise your combi boiler. You should re-pressurise it when the pressure has dropped to below 1 bar. This indicates that water has been lost from the system and needs to be replaced.
Is it normal for boiler pressure to be over 1.5?
A combi boiler pressure gauge reading over the 1.5 mark whilst the heating is in full operation, is likely normal due to the water demand being placed on the boiler so it’s likely nothing to worry about. In this instance, a reading between 1.5 – 2.5 bar can be considered normal.
When do you know if your boiler needs to be replaced?
On most digital gauges, you’ll see a flashing pressure reading, if there’s a low (or high) pressure warning. If your boiler pressure reads less than 1 bar, it’s possible that you might have lost water from the system, which needs to be replaced. This is where that filling loop (or filling link) comes in again!
How to check the pressure on a Worcester combi boiler?
1 Locate the Small BLUE Lever beneath your Worcester combi boiler 2 Pull the lever down and hold 3 Keep an eye on the pressure gauge & release the lever when the pressure gauge reaches 1.5 bar 4 Turn the boiler back on and recheck the pressure gauge
