F26
Siemens
Controller Non-Volatile Memory Fault
Controller shows F26 EEPROM/Memory Error; settings may not be saved and generator may not start.
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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, Controller firmware bug, Failing EEPROM chip, Voltage spikes during write operations
How to Fix / Troubleshooting
Safety first: Disable auto-start and isolate the generator from load before performing controller resets or firmware updates.
- Power cycle controller: Turn the controller off, disconnect battery power for several minutes, then reconnect. This can clear transient memory errors.
- Reload configuration: If you have a backup of the Siemens controller configuration, reload it using the recommended interface (USB, SD card, or PC software).
- Firmware update: Check with Siemens support for any firmware updates addressing memory issues. Follow official procedures to update firmware.
- Controller replacement: If F26 persists and settings will not save, the controller's memory hardware is likely failing and the controller PCB should be replaced.
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Repair Difficulty
Hard
4/5
Required Part
Generator Controller PCB
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