How do I fix Internal Communication Fault on a Growatt?

Power cycle inverter. Check firmware version matches expected version for the model Then: Update firmware via ShineServer if available

Growatt

Error 411

Internal Communication Fault

Communication error between internal inverter boards (e.g. main DSP to comms board).

Common causes

Firmware incompatibilityInternal hardware faultPower supply issue to comms board

What to check

STEP 1

Power cycle inverter. Check firmware version matches expected version for the model

STEP 2

Update firmware via ShineServer if available

Escalate if

Fault persists after power cycle — internal hardware fault, escalate

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