Vaillant
Electrical Noise / Relay Chatter
Vaillant smart thermostat or gateway emits a buzzing or clicking noise during operation.
Advertisements
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.
Advertisements
Possible Causes
Relay rapidly switching due to unstable control signal, Loose transformer or inductor vibrating, Incorrect load connected to low‑power output, Supply voltage fluctuations
How to Fix / Troubleshooting
Safety: Isolate mains power before opening any housings.
- 1. Identify source: Place your ear close (without opening) to determine if the noise comes from the thermostat, gateway, or wiring center.
- 2. Check control settings: Reduce overly aggressive control parameters (e.g. very tight hysteresis) that may cause rapid switching.
- 3. Verify load: Ensure that only appropriate low‑power control circuits are connected to the thermostat outputs, not pumps or large valves directly.
- 4. Check supply stability: Have an electrician verify that the mains supply is stable and within tolerance.
- 5. Replace noisy module: If a particular relay or transformer is mechanically noisy, replacement of the thermostat or gateway may be required.
Advertisements
Repair Difficulty
Medium
3/5
Required Part
Vaillant smart thermostat / wiring center relay
Check Price on Amazon
We may earn a commission from links on this page.
Advertisements