How to Top Up the Pressure on a Worcester Bosch Boiler

Here is an example of how to top the pressure up, on a Worcester bosch boiler with a keyless filling link. Here at Arlow plumbing and Heating, we fit these as standard to make the customer’s life as easy as possible.

Steps:
1. Turn Off the Boiler:

Ensure the boiler is switched off and has cooled down to avoid any potential injuries.

2. Locate the Filling Loop:

The filling loop is usually a silver, flexible hose located underneath the boiler. It might have a valve on either end.

3. Check the Pressure Gauge:

The pressure gauge is usually found on the front of the boiler. It should typically read between 1 and 1.5 bar when the system is cold.

4. Attach the Filling Key (if applicable):

Some models require a filling key to open the valves. If your boiler has a keyed filling loop, insert the key into the appropriate slot and turn it to unlock the filling loop.

5. Open the Valves:

Slowly open both valves on the filling loop. You should hear water flowing into the system. Monitor the pressure gauge closely as you do this.

6. Watch the Pressure Gauge:

As the water flows in, the pressure on the gauge will begin to rise. Allow the pressure to reach the recommended level (typically between 1 and 1.5 bar).

7. Close the Valves:

Once the desired pressure is reached, close both valves tightly to stop the water flow.
Remove the Filling Key (if used):

If you used a filling key, turn it back to the locked position and remove it.

8. Check for Leaks:

Inspect the filling loop and surrounding area for any signs of water leaks.

9. Turn the Boiler Back On:

Switch your boiler back on and check that it operates correctly.

Still Having Problems With Your Boiler Pressure?

If topping up your Worcester Bosch boiler has not solved the issue, or the pressure keeps dropping again, it is worth getting the system checked by a qualified heating engineer.

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