E15
Ariston
Power Supply / Low Voltage Fault
Ariston water heater shows E15; unit may intermittently shut down or restart.
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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
Unstable mains voltage, Loose power terminal connections, Faulty internal power supply on control board, Undersized wiring causing voltage drop
How to Fix / Troubleshooting
Safety first: Turn off power before tightening any terminals.
- Check mains supply: Use a multimeter to verify that the supply voltage at the heater matches the rating plate (e.g., 230 V ±10%). If voltage is low or fluctuating, consult an electrician.
- Inspect power terminals: Remove the cover and check that live, neutral, and earth wires are firmly secured in the terminal block. Tighten loose screws.
- Check cable size and length: Ensure the supply cable meets Ariston's recommended cross-section for the heater's power rating.
If E15 continues with a stable supply, the internal power supply section of the control board may be failing and should be replaced by a technician.
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Repair Difficulty
Medium
3/5
Required Part
Electronic Control Board
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