Step 1: Turn off your central heating and wait for around 20 minutes for the system to cool down. Step 2: Lay a dry cloth or towel beneath the radiator you want to bleed, just in case any water escapes. Step 3: Use your radiator key to slowly open the valve, turning it anti-clockwise to do so.

How do you clear an airlock in a central heating pump?

Step 1: Turn off your central heating and wait for around 20 minutes for the system to cool down. Step 2: Lay a dry cloth or towel beneath the radiator you want to bleed, just in case any water escapes. Step 3: Use your radiator key to slowly open the valve, turning it anti-clockwise to do so.

How do you remove air from Grundfos pump?

In some Grundfos models, there is a large vent screw on the pump. Place a large flat-head screwdriver into the slot of the vent screw, and turn the screw counterclockwise to loosen it in place. As you turn the screw, you should hear the sound of escaping air forced by the pressure of water behind the air.