How can we help?
Having trouble? Click here to access our troubleshooting guide.
Your Question:
Ultimate 24h
Click here to return to Glow-worm menu.
Controls
Water Pressure
Water pressure will only need checking if this boiler is installed on a sealed system.
The boiler should read 1 - 1.5 bar of pressure when the central heating is cold. If this drops below too low, for example 0.5, this normally means water has been lost from the Central heating heating system and the filling loop is used to replace this water. When the central heating is on, the pressure may increase on the boiler, however the pressure generally must not increase by more than 1 bar. If this is the case it could indicate an internal component of the boiler called an Expansion Vessel may need pressurising. A service engineer will need to be contacted in this case.
This appliance doesn't come with an integrated filling loop. There should be an external filling loop fitted to the system by your original installer. This will either be located below or around the boiler area or in the cylinder cupboard. Although there are many variations on what a filling loop will look like they will all carry out the same function so will look broadly similar. Two examples of external loops will look like the pictures below and connect across two separate pipes:
This type of filling loop has two taps on it. You would open one fully then slowly open the other until you start to hear water passing through. Once you hear water passing through keep an eye on the boiler's gauge, pressure reading or external pressure gauge and close the valve when it reaches 1 - 1.5 bar.
This type of filling loop only has one tap on it:
With this type you would slowly open the tap until you start to hear water passing through. Once you hear water passing through keep an eye on the boiler's gauge, pressure reading or external pressure gauge and close the valve when it reaches 1 - 1.5 bar.
If the system needs constantly topping up with water, this may indicate a fault. Please contact your installer.
Downloads
Click here to download the Installation & Servicing Manual.
Click here to download the User manual
Click here to download the Sealed system kit Manual.