Ariston
Air in System / Bypass Flow Noise
Boiler operates but makes a constant trickling or running water noise
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Possible Causes
Air trapped in radiators or boiler, Automatic bypass valve set too high, High pump speed, Partially closed valves causing high velocity
How to Fix / Troubleshooting
Safety: Allow system to cool before bleeding radiators.
- Bleed system: Bleed all radiators and the pump (if possible) to remove air.
- Check pressure: After bleeding, top up to 1.2–1.5 bar.
- Adjust pump speed: If your Ariston pump has multiple speeds, try reducing the speed to minimise noise.
- Bypass valve: An engineer can adjust the automatic bypass valve to reduce unnecessary flow noise.
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Repair Difficulty
Easy
2/5
Required Part
Automatic Bypass Valve
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