The "Check Grid CT / Installation Limit / Grid CT Lost" error is one of the most commonly reported issues in myenergi systems. Fortunately, it often does not require installer or myenergi involvement, as most cases can be resolved with a simple self-check and adjustment by the user. However, if the grid CT is missing or has not been installed, you will need to contact your installer to complete the setup.
Warning: The product must either be paired to a master or must be set to master. If not set to master, the message will always appear, even if there is no second device available.
Causes and Solutions for the "Check Grid CT / Installation Limit / Grid CT Lost" Error
This error may result from one or more of the following issues. Each section provides guidance on identifying and addressing the problem.
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Problem: Only one CT (or set of three in a three-phase system) should be designated as the grid CT to prevent conflicting readings, as there is only one physical grid connection to the property.
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Symptom: When multiple CTs are assigned to the grid, one may read zero, causing inaccurate data.
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Solution: Verify each device’s configuration. The tilde (~) symbol indicates a device with a configured Grid CT. Ensure only one device has this configuration; if others are incorrectly set to Grid, change their setting to NONE in the menu.
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Problem: The grid CT must be installed and activated to measure power flow accurately. If missing, not connected, or unactivated, your myenergi devices will not be able to monitor power or manage diversions effectively.
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Symptom: Inability to measure power flow or divert excess power accurately.
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Solution: Check the presence and proper setup of the Grid CT by looking for the tilde (~) symbol. If the CT is missing, the installer must return to fit and activate it.
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Problem: The Grid CT must monitor all power flowing into and out of the property. Incorrect placement can lead to inaccurate data.
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Symptom: Misreported or unreliable power flow readings.
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Solution: Confirm that the CT is installed on the live cable coming from the electricity meter to measure all power flows. In configurations involving a Henley Block or split consumer unit, ensure the CT is positioned correctly.
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Problem: A physically disconnected or malfunctioning Grid CT can result in erratic or absent data.
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Symptom: Inconsistent data or data loss.
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Solution: Inspect the Grid CT for secure connections and proper function. Replace if necessary.
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Problem: Incorrect wiring, placement, or a loose connection can affect measurement accuracy.
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Symptom: Missing or inaccurate readings.
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Solution: Ensure that the CT is installed according to myenergi's guidelines to prevent errors.
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Problem: Exceeding the rated capacity of the Grid CT may result in errors or device damage.
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Symptom: Overload errors.
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Solution: Ensure the current remains within the CT’s rated limit and upgrade the CT if necessary.
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- Problem: Loose, corroded, or damaged connections between the grid CT and monitoring/control equipment.
- Symptom: Disrupted signals.
- Solution: Check and secure all connections.
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- Problem: Bugs or glitches in the system software can cause misreading or loss of CT data.
- Symptom: Inconsistent or erroneous data.
- Solution: Update firmware/software and reboot the system if needed.
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- Problem: Electrical noise or interference from other devices or wiring affecting CT performance.
- Symptom: Erroneous readings.
- Solution: Mitigate interference sources or shield the CT wiring.
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- Problem: Extreme temperatures, humidity, or other conditions impacting CT performance.
- Symptom: Performance degradation.
- Solution: Protect the CT from extreme conditions.
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- Verify Configuration: Check each device to ensure only one has the Grid CT configured (~ symbol present).
- Check Physical Installation: Confirm the CT is installed on the live cable from the electricity meter.
- Inspect for Missing CT: Ensure a Grid CT is physically present and properly connected.
- Update Software: Ensure the latest firmware/software is installed and configured correctly.
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Impact of harvi Connectivity on Grid CT Performance
If you are using harvi and it disconnects due to distance or interference, this will temporarily stop the CT readings on the myenergi devices and provide the user an error. The system will automatically resume once connectivity is restored.
For troubleshooting harvi disconnections, please refer to our Troubleshooting Harvi Connectivity Issues.
Steps for Self-Resolution
- Verify Configuration: Check each device to ensure only one has the Grid CT configured (~ symbol present).
- Check Physical Installation: Confirm the CT is installed on the live cable from the electricity meter.
- Inspect for Missing CT: Ensure a Grid CT is physically present and properly connected.
- Update Software: Ensure the latest firmware/software is installed and configured correctly.