E15
Alpha
Internal Control Board Error
Unit shows E15; may occur after a power surge or lightning event.
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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
Damaged main control board, Corrupted firmware, Shorted low-voltage circuit, Incorrect line voltage
How to Fix / Troubleshooting
Safety: Turn OFF power at the breaker. Verify the circuit is de-energized before touching wiring.
- Inspect power supply: Confirm the Alpha water heater is connected to the correct voltage and that polarity and grounding are correct.
- Visual inspection: Remove the control board cover and look for burned components, bulging capacitors, or soot on the Alpha main control board.
- Power reset: Leave power OFF for at least 10 minutes, then restore. If E15 appears immediately, the board is likely damaged.
- Surge protection: Consider installing a surge protector to prevent future damage.
Main control board replacement and any firmware updates must be performed by an Alpha-authorized service provider.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board
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