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I HAVE ARISTON SG 80R ELECTRIC HOT WATER BOILER, HIGH PITCHED WHISTLING COMING FROM COLD INLET BRAIDED FLEXI HOSE,NOT CONSTANT, GOES AWAY WHEN YOU RUN COLD TAP... AIRLOCK??? 
whistling,whinning noise
- Thread starter johnnythefox
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check that any valves that are fully closed or open, if they are slightly open they will cause whistling, check that the handles or screw driver slots on the braided hose are fully closed (they should be anyway otherwise your system would be overpressurising and depressurising through the safety pipe).
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