SPH 3000–6000TL BL-UP / SPH 4000–10000TL3 BH-UP hybrid (Error 2xx–6xx codes)
Growatt Error 402 error code
DC component in the AC output current exceeds the disconnection threshold.
Likely causes
- Inverter output-stage fault
- Half-wave or strongly non-linear load on the output
- Firmware or control-loop problem
Checks to run, in order
- 1Restart the inverter as the manual directs
- 2Note whether the fault follows a particular appliance or load type
- 3Check the AC output wiring for any DC path or damaged insulation
Fixes
- Restart the inverter and observe the next few hours of operation
- Remove the suspect load and retest to confirm the correlation
When to escalate
If Error 402 returns after restart with the load disconnected, the output stage needs Growatt service.
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 Error 402 mean?
DC component in the AC output current exceeds the disconnection threshold.
How do I fix Growatt Error 402?
Restart the inverter and observe the next few hours of operation Remove the suspect load and retest to confirm the correlation
When should I escalate Growatt Error 402?
If Error 402 returns after restart with the load disconnected, the output stage needs Growatt service.
Can I reset Growatt Error 402 myself?
Only after isolating the AC and DC sides and running the checks above. If Growatt Error 402 returns immediately, stop resetting it and escalate; a repeating fault usually points to a real circuit, battery or hardware problem.
Which models show Growatt Error 402?
Growatt Error 402 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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