E50
Atlantic
Power Supply / Voltage Fault
Atlantic water heater shows E50; heating may be limited or disabled.
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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
Supply voltage out of range, loose terminal connections, undersized wiring, internal power supply failure on control board
How to Fix / Troubleshooting
Safety: Only qualified persons should work on mains wiring. Turn off the main breaker before opening the electrical junction box.
- Measure the supply voltage at the heater terminals with a multimeter; it must match the rating plate (e.g., 230 V ±10%).
- Inspect the terminal block for loose screws, discoloration, or melted insulation; tighten or replace as needed.
- Verify that the circuit breaker and cable size are appropriate for the heater's power rating.
- If supply voltage is correct and connections are sound, the internal power supply on the control board may be defective; replace the control board.
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Repair Difficulty
Hard
4/5
Required Part
Terminal Block / Control Board
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