Tesy
Bacterial Reaction with Magnesium Anode
Heater produces rotten egg (sulfur) smell in hot water.
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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
Sulfur-reducing bacteria in water supply, reaction between magnesium anode and minerals, prolonged low-temperature operation
How to Fix / Troubleshooting
Safety first: Odor is unpleasant but usually not directly harmful. However, use caution with high-temperature disinfection cycles.
Steps:
- Disinfect tank: Temporarily raise the thermostat or use the anti-legionella function to heat water to 60–70°C for several hours (ensure mixing valve is present to prevent scalding at taps).
- Flush system: After disinfection, flush hot water lines thoroughly.
- Consider anode change: Replace the magnesium anode rod with an aluminum-zinc anode (if approved by Tesy for your model) to reduce sulfur odor.
- Water treatment: If the problem persists, consider installing a whole-house water treatment system to reduce sulfur and bacteria.
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Repair Difficulty
Medium
3/5
Required Part
Magnesium Anode Rod
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