Worcester Bosch Combi Boiler filling loop Key how to use

Insert the key with the arrow pointing towards the unlock padlock symbol.
Turn the key to the locked pad lock symbol.
Open the White nut slowly and the system will start to fill.
When you have reached the desired pressure close the nut.
Turn the key back to the unlocked symbol.
Remove the key.
There will be some water in the key.

It's easiest to fill your system when the heating has been off and the radiator are cold.
Fill the system to around 1bar.

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