How to Repressurize Your Worcester Bosch Boiler: A Simple Guide
If your Worcester Bosch boiler shows low pressure, it can cause problems with heating and hot water. Thankfully, you can usually fix this issue yourself by repressurizing the boiler. There’s no need to call an engineer for this simple task, and it can save you time and money. Just follow this easy step-by-step guide to get your boiler back to the correct pressure.
Table of contents
Step By Step Process of Repressurize Worcester Bosch Boiler
Time needed: 5 minutes
Follow the below steps to repressurize worcester bosch boiler
- Turn Off the Power
Before doing anything, make sure to switch off the boiler to stay safe and prevent any electrical problems. You can do this by using the fuse spur switch, which is often a large red switch near the boiler. If you’re not sure where it is, you can also turn off the power at your home’s main switchboard.
- Locate the Filling Loop System
The filling loop connects your boiler to your mains water supply and is used to refill the system. You’ll find two types:
External Filling Loop: Typically found under the boiler, this is a metal braided hose with two valves. You may need a flat-head screwdriver to open and close the valves.
Internal Filling Loop: Built inside the boiler, this usually requires a filling key or lever to operate.
If you’re using an external loop, make sure to remove the hose when done to - Open the Valves to Refill the System
Open the mains water valve first, then slowly open the second valve leading to the boiler. As the system fills, monitor the pressure gauge and aim for around 1.5 bar (typically in the green zone). Open both valves gradually to avoid over-pressurising the system.
- Close the Valves
Once the correct pressure is reached, close the boiler valve first, followed by the mains water valve, ensuring both are fully tightened to prevent the pressure from rising again. If you used an external filling loop, remove the hose at this stage and be prepared for any residual water.
- Turn the Boiler Back On
Once the pressure is right, turn the boiler back on. Keep an eye on the pressure gauge after it starts up to make sure it remains stable.
- How to Drain Excess Pressure
If your system becomes over-pressurised from adding too much water, you can reduce the pressure by bleeding a radiator. Locate the bleed valve at the top, then slowly turn it anticlockwise using a radiator key or flat-head screwdriver, keeping a container ready to catch any water. Monitor the pressure gauge as you release air and water, and once it returns to the correct level, close the valve securely.
When to Call a Gas Safety Engineer
While repressurizing your Worcester Bosch boiler is simple, there are times when you should call a Gas Safe registered engineer:
- If the pressure keeps dropping: This could indicate a leak in the system.
- If you’re unsure how to safely repressurize: If you don’t feel comfortable performing the task, it’s best to call an engineer.
- For any other issues with the boiler: If the boiler has issues beyond pressure (like strange noises, leaks, or failure to turn on), a professional should inspect it.
It’s always important to prioritize safety. A Gas Safe engineer can help with any complex problems and ensure everything is working properly.
Final Thoughts
Repressurizing your Worcester Bosch boiler is an easy task that can prevent heating and hot water issues. By following these simple steps, you’ll ensure that your boiler stays in good working condition. Just remember to check the pressure regularly and schedule annual maintenance to avoid future problems.
Frequently Asked Questions
When the heating system is cool, the pressure should be between 1 and 1.5 bar on the pressure gauge (the indicator needle would usually be in the green section). If pressure is below 0.5 bar (down in the red section), water has been lost from the system and must be replaced.
If the pressure gauge indicates high pressure as a result of over filling, you will need to bleed a radiator until the pressure gauge returns between 1 and 1.5 bar. Read our guide on how to repressurise your system.
How do I increase the pressure on my Worcester boiler? To increase the pressure on a Worcester boiler, locate the filling loop, usually at the bottom of the unit. Turn the valve to allow water into the system until the gauge indicates the pressure is between 1 and 1.5 bar.
