SPH 3000–6000TL BL-UP / SPH 4000–10000TL3 BH-UP hybrid (Error 2xx–6xx codes)
Growatt CT LN Reversed error code
The CT is connected with line and neutral reversed, or its PE reference is missing.
Likely causes
- CT clamped on the wrong conductor
- L and N swapped at the CT wiring
- CT PE wire not connected
- CT installed backwards relative to power flow
Checks to run, in order
- 1Check whether the L and N of the SP-CT are reversed
- 2Check the connection of the SP-CT PE wire
- 3Check the CT arrow/orientation against the direction of grid power flow
- 4Check the CT is on the correct conductor at the meter position
Fixes
- Re-clamp the CT on the correct conductor in the correct direction
- Correct the L/N wiring and connect the PE reference
- Restart the inverter and confirm the CT reading matches the meter
When to escalate
If the CT is correctly installed and 'CT LN Reversed' persists, ask Growatt support to check the CT input.
Fix it with the right tools
Check the system around the fault before replacing parts: load, battery bank, PV string and commissioning settings. If you need a second opinion, send the code and your inverter model to our team.
Before you open the inverter
- Isolate both the AC and DC sides, then confirm the display is dead before touching terminals.
- Use insulated tools and one hand where possible. DC arcs do not self-extinguish like AC.
- If you see burnt terminals, swollen cells, leaking electrolyte or a burning smell, stop and escalate instead of resetting the fault.
Questions installers ask
What does Growatt CT LN Reversed mean?
The CT is connected with line and neutral reversed, or its PE reference is missing.
How do I fix Growatt CT LN Reversed?
Re-clamp the CT on the correct conductor in the correct direction Correct the L/N wiring and connect the PE reference Restart the inverter and confirm the CT reading matches the meter
When should I escalate Growatt CT LN Reversed?
If the CT is correctly installed and 'CT LN Reversed' persists, ask Growatt support to check the CT input.
Can I reset Growatt CT LN Reversed myself?
Only after isolating the AC and DC sides and running the checks above. If Growatt CT LN Reversed returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Growatt CT LN Reversed?
Growatt CT LN Reversed is documented for SPH 3000–6000TL BL-UP / SPH 4000–10000TL3 BH-UP hybrid (Error 2xx–6xx codes). Confirm the code on your own unit's display or manual before ordering parts.
More Growatt error codes
- Growatt 01Fan is locked (displayed as F01 on the SPF ES Lite).
- Growatt 02Internal component temperature is over 100 °C (F02 on the ES Lite).
- Growatt 03Battery is over-charged / battery voltage is too high (F03 on the ES Lite).
- Growatt 04Battery voltage low.
- Growatt 05Output is short-circuited (F05 on the ES Lite).
- Growatt 06Output voltage is too high. The manual groups 06/58 as 'output abnormal' — inverter voltage above 150 Vac or below 40 Vac.
Guidance reviewed 17 October 2026 by the Mishka Energy installer team. Error codes vary by brand, model family and firmware; confirm against the manufacturer manual.
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