E17
Kospel Main Control Board Internal Error

Boiler shows E17; internal fault indicated, boiler unresponsive to user commands

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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

Microcontroller fault, Corrupted firmware, Short circuit on control board, Overvoltage damage

How to Fix / Troubleshooting

Safety first: Disconnect the boiler from mains power before inspecting internal electronics.

Steps to check:

  • Power cycle: Leave the boiler powered off for at least 2–3 minutes, then restore power to see if the error clears.
  • Inspect PCB: Remove the control board cover and look for burnt components, bulging capacitors, or signs of moisture damage.
  • Check external wiring: A short in connected components (e.g., pump, valves) can trigger board errors. Disconnect non-essential loads one by one and see if the error changes.
  • Verify correct supply: Ensure the boiler is supplied with the correct voltage and that there are no frequent power surges.

When to call a technician: Control board repair or replacement and firmware updates must be performed by an authorized Kospel service center.

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Repair Difficulty

Professional Required 5/5

Required Part

Main Control Board
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