Many but not all central heating systems have a filter, which water continually cycles through to remove impurities. They also double up as drainage valves, and are perfect for relieving pressure in the system. Put a bucket under the filter, open the valve and keep an eye on the gauge.
Close the valve when it reaches 1 bar. This is located in the pipework for the central heating system. It will be a Y-shaped or T-shaped component branching from the pipework, with a valve that might require a spanner to open. Place a bucket or tub underneath it and open it up, checking the pressure on the boiler.
As well as releasing air trapped in the system, bleeding can also be carried out to lower the water pressure. Water will squirt out, so you should also protect any wallpaper and carpets nearby.
Place a container underneath a radiator nut that connects the pipework to the radiator, and gently undo the nut with a spanner. Take a look at the suggestions below. The filling loop is where water enters the system from the mains, and consists of two valves. When both valves are open, the system lets more water in, and the pressure rises.
A prime suspect for high pressure is these valves being left open accidentally. It looks like you might not be in the UK? The products and services presented on this page may not be available in your country; find your local Viessmann website below.
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