Check under the boiler and locate the cold water supply pipe (15mm), there will be a valve located in the pipe (flexi-hose) or on the boiler nearby. Open the inlet and you will hear water entering the system. Monitor the guage to 1 to 1.5 bar. You may need to bleed the radiators after repressurising (heating off) as there may be air in the system causing a loss of pressure.
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