SPH 3000–6000TL BL-UP / SPH 4000–10000TL3 BH-UP hybrid (Error 2xx–6xx codes)
Growatt Warning 401 error code
SP-CT/meter communication fault — the inverter cannot read the CT or meter (shown as 'Meter Communication fault' on the BH-UP).
Likely causes
- CT/meter wiring disconnected or loose
- SP-CT or meter out of communication range
- Meter not powered or faulty
- Wrong CT/meter type selected in the inverter
Checks to run, in order
- 1Check the wire connection between the meter/SP-CT and the inverter
- 2Check the distance between SP-CT and inverter is within the specified range
- 3Confirm the meter or CT is powered
- 4Check the meter/CT type setting in the inverter
Fixes
- Reseat the communication wiring
- Move the SP-CT within range of the inverter
- Restart the inverter and SP-CT and reconnect them
When to escalate
If wiring and range are correct and Warning 401 persists, ask Growatt support to check the meter interface and CT.
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 Warning 401 mean?
SP-CT/meter communication fault — the inverter cannot read the CT or meter (shown as 'Meter Communication fault' on the BH-UP).
How do I fix Growatt Warning 401?
Reseat the communication wiring Move the SP-CT within range of the inverter Restart the inverter and SP-CT and reconnect them
When should I escalate Growatt Warning 401?
If wiring and range are correct and Warning 401 persists, ask Growatt support to check the meter interface and CT.
Can I reset Growatt Warning 401 myself?
Only after isolating the AC and DC sides and running the checks above. If Growatt Warning 401 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Growatt Warning 401?
Growatt Warning 401 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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