E15
BWT Internal Control Board Fault / EEPROM Error

Heater shows E15 and will not operate; may occur after a power surge

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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

Corrupted control board memory, Power surge or lightning damage, Faulty main PCB, Incorrect firmware for model

How to Fix / Troubleshooting

Safety first: Turn off power at the breaker before opening the control panel.

  • Hard reset: Disconnect power for at least 10 minutes to allow capacitors to discharge and the control to fully reset. Restore power and check if E15 clears.
  • Inspect PCB: Visually inspect the main control board for burnt components, cracked solder joints, or signs of moisture damage.
  • Check grounding: Ensure the heater is properly grounded and that surge protection is installed if recommended by BWT.

If E15 persists after a hard reset, the main control board is likely defective or has corrupted firmware. Replacement of the PCB with a BWT-approved part is typically required and should be done by a qualified technician.

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Repair Difficulty

Professional Required 5/5

Required Part

BWT Main Control Board (PCB)
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