Saunier Duval
Noisy Relay Operation / Electrical Buzz
Thermostat or RF receiver emits a clicking or buzzing noise frequently
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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
Relay chattering due to unstable control signal, Loose relay coil or contacts, Undervoltage on relay coil supply, Incorrect control mode causing rapid cycling
How to Fix / Troubleshooting
Safety: Turn off power to the RF receiver and boiler before opening any covers.
- Observe cycling: Check if the thermostat is rapidly switching demand on and off (flame icon flickering). If so, adjust control parameters (increase cycle time or enable TPI).
- Secure mounting: Ensure the RF receiver is firmly mounted to reduce vibration noise.
- Check supply: Have a technician verify that the receiver is supplied with stable 230 V and that neutral and live are correctly connected.
Persistent loud buzzing or chattering usually indicates a failing relay; replace the RF receiver or thermostat as appropriate.
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Repair Difficulty
Medium
3/5
Required Part
Saunier Duval RF Receiver Relay
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