Check Grid CT / Installation Limit / Grid CT Lost
This message appears when the system detects a problem with the Grid CT setup or readings. It is a common issue and often easy to fix with basic checks.
Important
Some steps involve checking wiring or the physical installation of a CT clamp. This must only be done by a suitably qualified person. If you are unsure, speak to your installer before doing any work.
Note
The device must either be set as a Master or paired to one. If it is not, this message will appear even if there are no other devices on the system.
Tap the dropdowns below to view each possible cause and solution.
- Problem: Only one CT (or one set of three for three-phase) should be assigned as the Grid CT. Having more than one causes conflicting readings.
- Symptom: One CT may read zero or show incorrect values.
- Solution: Check all devices. Only one should show the tilde (~) symbol, which means it’s set as the Grid CT. Change any others from Grid to NONE in the menu.
- Problem: If the Grid CT has not been installed or activated, the system cannot measure or control power flow.
- Symptom: No grid readings or power diversion.
- Solution: Look for the tilde (~) symbol to confirm the CT is present. If missing, contact your installer to fit and activate the Grid CT.
- Problem: The Grid CT must monitor all electricity flowing into and out of the property. Incorrect placement leads to false readings.
- Symptom: Readings that don’t match usage or exports.
- Solution: The CT should be fitted on the live cable from the electricity meter. In setups using a Henley block or split consumer unit, confirm the CT is positioned before any branch circuits.
- Problem: A damaged or unplugged CT will stop readings or show unstable data.
- Symptom: Data loss or erratic readings.
- Solution: Check connections are secure. Replace the CT if it’s damaged or not working correctly.
- Problem: Incorrect wiring or loose fittings cause poor readings.
- Symptom: Missing or inaccurate measurements.
- Solution: Have the installer check that wiring follows myenergi’s CT fitting guidance.
- Problem: The CT’s rated current limit has been exceeded.
- Symptom: “Installation Limit” or overload messages.
- Solution: Ensure current is within the CT rating. Fit a higher-rated CT if required.
- Problem: Loose or corroded CT wiring disrupts signal.
- Symptom: Inconsistent or dropped readings.
- Solution: Secure or replace any damaged wiring or terminals.
- Problem: Outdated firmware or software can cause CT errors.
- Symptom: Incorrect or inconsistent readings.
- Solution: Update to the latest firmware and reboot the system.
- Problem: Electrical noise or nearby high-current cables can affect CT readings.
- Symptom: Unstable data or fluctuating readings.
- Solution: Route CT cables away from other high-power wiring or use shielding.
- Problem: Moisture, cold, or heat may degrade CT performance.
- Symptom: Unreliable readings or gradual drift.
- Solution: Protect the CT from damp or extreme temperature exposure.
Impact of harvi connectivity
If your system uses a harvi and it disconnects due to range or interference, CT readings will stop temporarily and an error will display. Once the connection is restored, normal operation resumes automatically.
See Troubleshooting harvi connectivity issues for further help.
Steps for self-resolution
- Ensure only one device is set as Grid CT (tilde symbol ~ visible).
- Check CT is installed on the live cable from the electricity meter.
- Confirm the Grid CT is present and connected correctly.
- Update all device firmware and restart if necessary.