E21
Himoinsa
Controller Internal Fault / Configuration Error
Generator controller displays E21 and the unit will not start in automatic mode.
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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 controller firmware, Incorrect configuration parameters, Internal hardware failure, Power supply instability to controller
How to Fix / Troubleshooting
Safety: Turn OFF generator and isolate control power before removing the controller.
- Power cycle controller: Disconnect controller power for several minutes, then reconnect and check if E21 clears.
- Check supply voltage: Measure DC supply to the controller and ensure it is within the specified range. Inspect fuses and wiring.
- Reload configuration: Using Himoinsa or controller manufacturer software, reload the correct configuration file if available.
- Firmware update: If supported, update the controller firmware to the latest approved version.
- Replace controller: If E21 persists and configuration/power are correct, the controller may need replacement by an authorised Himoinsa service provider.
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Repair Difficulty
Professional Required
5/5
Required Part
Generator Controller
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