E11
Hewalex
EEPROM / Parameter Memory Error
Unit shows E11 and will not start; sometimes occurs 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 configuration data in EEPROM, Faulty main control PCB, Voltage spikes or unstable power supply, Incorrect firmware or parameter set
How to Fix / Troubleshooting
Safety first: Disconnect power before touching electronics.
- Power cycle: Turn off the breaker for at least 5 minutes to allow capacitors to discharge, then restore power and check if the error clears.
- Check supply quality: Ensure the heater is connected to a stable power source with proper grounding. Consider using a surge protector if local power is unstable.
- Factory reset (if available): Some Hewalex controllers allow a parameter reset via the keypad. Follow the user manual to restore default settings.
- When to call service: If E11 persists, the main PCB may need reprogramming or replacement by an authorized Hewalex service center.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control PCB
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