E22
Genergy
Controller Communication / CAN Bus Fault
Generator displays E22; controller indicates CAN bus or internal communication error.
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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
Loose or corroded communication connectors, Damaged CAN bus cable between modules, Incorrect termination resistors, Faulty expansion module
How to Fix / Troubleshooting
Safety first: Turn the generator OFF and disconnect battery power before unplugging or plugging control cables.
- Inspect CAN wiring: Locate the twisted‑pair CAN bus cable linking the Genergy controller to any expansion modules (e.g., remote display, ATS interface). Check for cuts, pinches, or rodent damage.
- Reseat connectors: Unplug and firmly reinsert CAN connectors at each module. Look for bent pins or corrosion.
- Check termination: Ensure that only the end devices on the bus have termination resistors installed, as specified by Genergy. Remove any extra terminators.
- Isolate faulty module: Disconnect modules one at a time and power up to see if E22 clears. Replace the module that causes the fault when connected.
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Repair Difficulty
Medium
3/5
Required Part
Control Module Harness
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