If yes follow your boiler manual to show you how to re-pressurise
If no are there 2 valves capped off - on the pipework near the boiler - or 2 valves connected with a silver braided hose ? if yes turn the valve so it is inline with the pipe - re-pressurise to 1.0 - 1.5 bar then turn valve so it is off - vent upstairs re pressurise if needed.
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