E07
Stiebel Eltron Control Board / Electronics Fault

Stiebel Eltron heater displays E07 and will not start heating; sometimes occurs after 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

Internal failure of main control PCB, Damage from power surge or incorrect wiring, Corrupted firmware (on advanced models), Shorted low-voltage component on board

How to Fix / Troubleshooting

Safety: Turn off all power at the breaker. Do not work on live electronics.

  • Power cycle: Leave the unit powered off for at least 5 minutes, then restore power to see if the error clears. Some transient faults reset this way.
  • Inspect wiring and terminals: Remove the cover and check for loose main power connections, burnt spots, or signs of moisture on the control board. Correct any obvious wiring issues.
  • Check for external causes: Verify supply voltage is within the specified range and that neutral/ground connections are correct. Overvoltage or missing neutral can damage the board.
  • Board replacement: If E07 persists and there are no sensor or wiring faults, the main control board is likely defective. Replacement typically requires transferring all connectors one-by-one to the new OEM board. This should be done by a qualified technician due to high-voltage hazards and the need to verify correct wiring.
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Repair Difficulty

Professional Required 5/5

Required Part

Main Control Board (PCB)
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