Ngenic
Electrical Buzz / Coil Noise
Thermostat or control module emits a buzzing or humming noise, especially when heating is active.
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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
Vibrating relay coil in Ngenic control module, Loose mounting causing resonance, Transformer hum in power supply, Overloaded relay contacts arcing slightly
How to Fix / Troubleshooting
Safety: Isolate mains power before opening any control module housing.
- Check mounting: Ensure the Ngenic control module is firmly mounted to a solid surface, not loosely hanging.
- Listen for source: With power on (cover in place), carefully listen to identify whether the noise comes from the thermostat or boiler interface.
- Reduce load (advanced): Have a professional verify that the relay is not switching a load beyond its rated current.
Persistent loud buzzing from a relay or transformer usually requires replacement of the Ngenic control module or its power supply by a technician.
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Repair Difficulty
Hard
4/5
Required Part
Ngenic Boiler Interface / Control Module
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