Repressurise Worcester boiler

How can I tell if my Worcester Bosch boiler pressure is too low?

A Worcester Bosch boiler with low pressure is usually characterised by a malfunctioning heating system or boiler. To confirm, you can check the water pressure gauge at the boiler’s front. It will either be a digital or a standard pressure gauge with a needle.

The ideal reading for the gauge should be between 1bar and 1.5bar. If it reads below 1 bar, then youyou have low boiler pressure and you need to re-pressurise your Worcester boiler.

What causes a Worcester boiler pressure to drop?

Two main reasons your Worcester boiler loses pressure are: Leakage in the system can cause a loss in water pressure. Make sure to inspect your boiler, pipes, and radiators for damp spots.

You should not look into your boiler as only a Gas Safe engineer should. If you find a leak then you really need to call a qualified engineer as soon as possible.

Bleeding radiators can also cause a loss in boiler pressure and as part of the full procedure, it is important to re-pressurise the boiler afterward.

How to deal with a Worcester Bosch boiler that has low pressure

Your boiler pressure could be the reason you are experiencing problems with your boiler. You will need to increase your boiler pressure if your heating system is less efficient or your pressure gauge is showing red.

How to repressurise your Worcester boiler

It is easy to top up your boiler pressure without the need for a heating engineer. First, identify the type of filling system that you have. Next, follow the instructions depending on the type of boiler you have and how old it is. Newer models will have a keyless filling link which is easy to use, whereas older models will require the external filling loop.

Here are the different ways in which to repressurise a Worcester bosch boiler

External filling loop

It will be easy to tell if your external filling loop is working. There will be two valves, one for mains cold water, and another that connects to the heating system.

  • Attach the hose to one end of the valve, and turn on the mains cold water tap.
  • The second tap allows water to enter the heating system.
  • Keep an eye on the pressure and then stop when it reaches about one. Then, turn off both taps
  • Take out the taps. There will be water dripping from the hose so be careful.

Internal Filling Loop (Keyed)

You will find the key on the boiler’s flap. It may also be included in the installation.

  • You’ll see an open port in the front right-hand side. This is where you will find the key.
  • There is a picture showing an open and closed padlock. On the white key, there is an arrow. Align the shaft with the open padlock while pushing it into the open port.
  • You can turn the key to increase the pressure to just under one bar.
  • Then, turn the key to the padlock open and take it out. Pay attention to any water that may be dripping

Keyless Internal Filling Loop

You can easily identify a keyless filling loop by the blue lever located at the bottom your boiler

  • Simply pull the blue lever to repressurize your system using the keyless filling connection
  • When the pressure has reached over one bar, you can release the lever

Does your Worcester Bosch boiler lose pressure daily?

Your boiler should not lose pressure if you are regularly topping up your boiler. Before you look for leaks in your system, check your pressure gauge.

  1. Is your pressure gauge at high pressure before your heating begins to cool down?
  2. Is that a copper pipe dripping hot water or spraying it on an outside wall?

If you see any of these symptoms, your boiler’s expansion vessel may need to be recharged. This fault is common for all brands of boilers and must be handled by a Gas Safe registered engineer. This should be done as part of boiler servicing.

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