Zappi shows E009, charging stops, often when using ECO or ECO+ modes with CT clamps

Safety first: CT clamps measure current on live conductors; do not remove covers on live distribution boards unless you are qualified.

• 1. Check CT connections: At the Zappi, verify that the CT clamp leads are firmly connected to the correct CT terminals (CT1, CT2, etc.) and that the cable is not damaged.
• 2. Confirm CT orientation: Ensure the arrow on the CT clamp points in the direction of load (usually towards the house or towards the consumer unit, per myenergi instructions). Reverse if necessary.
• 3. Inspect CT cable route: Look for crushed, cut, or extended CT cables. Avoid running CT cables parallel to mains cables over long distances without twisting or shielding.
• 4. Check CT configuration: In the Zappi menu, go to Advanced > CT Config and confirm each CT is assigned correctly (e.g. Grid, Generation, etc.). Incorrect assignment can cause CT errors.
• 5. Test with CTs disabled: Temporarily disable CT usage in the settings (or unplug CTs) and switch to FAST mode. If E009 disappears, the issue is with CT hardware or wiring.
• 6. Replace CT or main PCB if needed: If a known-good CT still triggers E009, the CT input circuitry on the main PCB may be defective.