SPH 3000–6000TL BL-UP / SPH 4000–10000TL3 BH-UP hybrid (Error 2xx–6xx codes)
Growatt Error 302 error code
The inverter sees no AC grid connection at its input.
Likely causes
- Grid outage
- AC input breaker open or MCB tripped
- AC input wiring disconnected or terminal loose
- Grid-side isolator switched off
Checks to run, in order
- 1Confirm supply at the main distribution board
- 2Check the AC input breaker and isolator at the inverter
- 3Measure AC voltage at the inverter AC input terminals
- 4Check terminal torque and cable continuity on the AC input
Fixes
- Close the AC breaker or isolator once supply is confirmed
- Repair loose or broken AC input wiring
- Restart the inverter after AC supply is present
When to escalate
If grid voltage is present at the AC terminals and Error 302 persists, ask Growatt support to check the AC input detection circuit.
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 302 mean?
The inverter sees no AC grid connection at its input.
How do I fix Growatt Error 302?
Close the AC breaker or isolator once supply is confirmed Repair loose or broken AC input wiring Restart the inverter after AC supply is present
When should I escalate Growatt Error 302?
If grid voltage is present at the AC terminals and Error 302 persists, ask Growatt support to check the AC input detection circuit.
Can I reset Growatt Error 302 myself?
Only after isolating the AC and DC sides and running the checks above. If Growatt Error 302 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 302?
Growatt Error 302 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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