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Tried repressurising by turning valve on filling loop. Normally you hear water whoosh through. This time no water. Took lever off and turned with spanner then took loop off and tried again. Water is coming through so now thinking broken NRV, is there a way to fix them or could it be an issue further up the boiler (Baxi 105E)? Is there any other valves that may be switched off? Any help would’ve greatly appreciated.