How do I Repressurise my Greenstar?

Locate the filling key and follow the instructions for re-pressurising.

  1. Push the filling key firmly into the body of the filling link, ensuring the arrow on the key shaft lines up with the open padlock symbol.
  2. Turn the filling key to the right, to the stop, ensure the key is locked and that it cannot still turn.

How do I know if expansion vessel is broken?

If you think the vessel has failed, unscrew the plastic cap from the pressurisation valve (it’s like a car tyre valve). Momentarily depress the pin in the valve to release a little pressure. If water comes out of the valve you have a definite expansion vessel fault.

How do I Repressurise my new Worcester boiler?

Turn the key anti-clockwise until the arrow is facing you. Then gently turn the white square clockwise to allow cold mains water into the system. You should be able to hear it. Wait for the water pressure to reach between 1 and 1.5 on the pressure gauge.

Do I need to turn my boiler off to Repressurise?

It is not necessary to turn the boiler off to repressurise the system. You won’t have to switch off the power to it either. You will need to turn off the central heating, which can be done from the room thermostat, and let the system cool before filling it with more water.

What happens if no pressure in expansion vessel?

Expansion vessels work at pressure. If this pressure is lost, the expansion vessel cannot do its job and the boiler will fail to start or will automatically shut down.

What happens when expansion vessel fails?

If water comes out of the valve it means that the diaphragm has failed inside the expansion vessel, and you will need to replace the vessel or with some units you can just replace the internal neoprene bladder. If air comes out of the Schrader valve you need to check the pressure of the charge in the vessel.

How do I increase the pressure on my Worcester combi boiler?

External Filling Loop

  1. Attach the hose to each side of the valve and open the mains cold tap.
  2. Open the second tap which allows water in to the heating system.
  3. Watch the pressure rise and stop once the bar reaches just about one and turn off both taps.