Water heater makes loud banging or popping noises during operation.
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.
Possible Causes
How to Fix / Troubleshooting
Safety: Turn off power and gas if noises are violent or accompanied by overheating smells.
Steps:
- Check flow and filters: Ensure inlet filter is clean and valves are fully open to maximize flow.
- Reduce set temperature: Temporarily lower the DHW set temperature to reduce stress on the heat exchanger.
- Plan descaling: Arrange for a professional chemical descaling of the Sime primary heat exchanger to remove limescale.
Professional help: Kettling is a sign of advanced scaling and should be addressed by a qualified technician to prevent heat exchanger damage.
Repair Difficulty
Required Part
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