> ## Documentation Index
> Fetch the complete documentation index at: https://learning.kent.co.in/llms.txt
> Use this file to discover all available pages before exploring further.

# Wrong-CT Symptoms: Five Reading Patterns and Fix Order

> Symptom map table for bad CT installations, platform fault codes E105/E106/E107, and the physical-first fix order before touching any settings.

A wrong CT rarely announces itself with a clear error — instead it makes the system look broken in ways that waste hours of settings investigation. This page maps each reading pattern back to the clamp so you can go straight to the right fix.

## The symptom map

| What you see on the display                                             | What it means                                                    | Fix                                                                                               |
| ----------------------------------------------------------------------- | ---------------------------------------------------------------- | ------------------------------------------------------------------------------------------------- |
| Import/export **signs flipped**; battery discharging to the grid        | CT reversed, or on the wrong conductor                           | Fix physically per [Direction & Location](/ct-meter/direction-and-location); re-run the live test |
| Load reads **0 W** with loads clearly running                           | CT clamped around both live and neutral — magnetic fields cancel | Re-clamp on the live conductor only                                                               |
| Power **wrong by a large factor** (e.g. 10× or ÷10)                     | CT ratio setting does not match the clamp                        | Read the ratio from the shipped CT nameplate and set exactly that value                           |
| **Fast, continuous power fluctuation** with steady loads                | CT direction wrong — the control loop is chasing itself          | Verify arrow toward grid; run the live test to confirm                                            |
| One phase **imports while another discharges** simultaneously           | CT-to-phase mismatch on a three-phase installation               | Re-map per [Meter & Phase Matching](/ct-meter/meter-phase-matching)                               |
| **Phantom import or export**, noisy small readings with no load changes | Extended or damaged CT lead picking up noise                     | Restore the design-length lead; do not extend CT leads                                            |
| Export logic not responding; **grid figures frozen**                    | CT lead open-circuit or RJ45/terminal connection unseated        | Continuity check and reseat per the platform CT page                                              |
| **SOC frozen** on the inverter display                                  | Not a CT fault — comm link is down                               | Go to [Cable Checks](/battery/cable-checks)                                                       |

## What the display tells you by platform

The platforms signal CT trouble differently. Read your platform's indicator first:

**Kent M1:** the LCD raises specific fault codes for CT problems.

| Code     | Meaning                        | Starting action                                      |
| -------- | ------------------------------ | ---------------------------------------------------- |
| **E106** | Meter or CT abnormal           | Check direction, phase mapping, and cable continuity |
| **E107** | Meter or CT reverse connection | Check CT wiring direction                            |
| **E105** | Anti-backflow breach           | Often CT-rooted — check CT before export settings    |

**Kent G3:** there is no dedicated alarm for a reversed CT. The tell is the **fast-fluctuating power pattern** in the symptom table above and wrong flow shown on the energy screen. The source manual's FAQ sends you directly to the CT arrow as the first action.

## The fix order — physical, then settings, then re-test

Work this sequence in order. Skipping ahead wastes time.

<Steps>
  <Step title="Location">
    Confirm the CT is at the grid connection point on the live conductor only. Nothing else is the correct position.
  </Step>

  <Step title="Direction">
    Confirm the arrow is toward the grid on every CT. Physically re-clamp if it is reversed.
  </Step>

  <Step title="Phase mapping (Kent G3)">
    Confirm CT, conductor, and terminal leads all match on each phase — L1 with L1, L2 with L2, L3 with L3.
  </Step>

  <Step title="Ratio">
    Confirm the ratio in settings matches exactly what is printed on the shipped CT's nameplate.
  </Step>

  <Step title="Software orientation — only now">
    If a software setting needs updating to reflect the corrected physical install, set it now: M1 *Meter CT orientation*, G3 *Forward / Reversal*. Only set these to describe the physical truth — never to paper over a physical error.
  </Step>

  <Step title="Re-run the Energy-Flow Test">
    A CT fix without the live test is a guess. Run all three tests in [Energy-Flow Test](/ct-meter/energy-flow-test) and record the results.
  </Step>
</Steps>

<Warning>
  Do not use the G3 *Reversal* setting to fix a clamp that is physically right there and can be re-clamped. Physical correction is always the right move when the CT is accessible.
</Warning>

## Common mistakes

<AccordionGroup>
  <Accordion title="'Fixing' a reversed clamp with the Reversal setting instead of re-clamping">
    If the CT is accessible, re-clamp it. The software setting is a last resort for a CT that genuinely cannot be reached — not a shortcut.
  </Accordion>

  <Accordion title="Hunting settings for an hour when load reads 0 W">
    Zero-watt load with loads clearly running is always a live-and-neutral clamp. It has no settings fix. Re-clamp on the live conductor only.
  </Accordion>

  <Accordion title="Declaring the CT fine because the sign looks right at noon">
    With PV generating, solar output can mask import and make a reversed CT look correct. Test condition is always grid ON, PV OFF.
  </Accordion>

  <Accordion title="Blaming the battery for 'discharging to grid at night'">
    A flipped CT sign makes the control loop drive the battery to compensate for a false export reading. The battery is obeying the control — the CT is the fault.
  </Accordion>
</AccordionGroup>

## Related pages

* [CT Basics](/ct-meter/ct-basics)
* [Direction & Location](/ct-meter/direction-and-location)
* [Meter & Phase Matching](/ct-meter/meter-phase-matching)
* [Energy-Flow Test](/ct-meter/energy-flow-test)
* [Zero Export — The Concept](/ct-meter/zero-export-concept)