Vaillant vSMART
Relay Operation Noise
Noticeable clicking or buzzing noises from the vSMART boiler interface or relay box when heating turns on or off.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Mechanical relay switching under load, loose mounting causing vibration, failing relay coil, high inrush current from boiler controls
How to Fix / Troubleshooting
Safety warning: The interface may contain mains‑voltage components. Only qualified personnel should open the housing.
Steps to address noise:
- Check mounting: Ensure the interface box is securely mounted to a solid surface to reduce vibration noise.
- Normal vs abnormal: Occasional soft clicks are normal for relays. Loud buzzing or rapid chattering is not and indicates a fault.
- Electrical inspection (pro): A technician should inspect the relay contacts and coil, and verify that the boiler input is not causing rapid switching.
Faulty relays should be replaced by a professional to avoid overheating or control failure.
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Repair Difficulty
Hard
4/5
Required Part
vSMART Boiler Interface Relay
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