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GoodWe inverter error codes for grid, isolation, temperature and internal faults, with clear guidance on self-recovery versus service.
A reference compiled by Solar Analytica from GoodWe documentation and field sources. GoodWe shows faults as a numbered error code and/or a named fault depending on the model — on an LCD unit, short-press the front button and scroll to “Error”/“Fault”; on ET/EH/EHB hybrid units, check Alarms in the SolarGo app or the SEMS portal. Where a fault has both a number and a name, we list them together, and both are searchable. Safety note: earth and insulation faults (Isolation, Ground I, PE Loss) need a licensed electrician — don't keep resetting them; and for a PV over-voltage, switch off the DC isolator before anything else.
20 of 20 codes
An internal communication (SPI bus) failure inside the inverter.
What to do
Restart the inverter (AC off, DC isolator off, wait 5 minutes, reverse). If it returns, it needs servicing — contact your installer or GoodWe.
A read/write failure on the inverter's memory chip.
What to do
Restart the inverter. If the fault remains, it needs servicing — contact your installer or GoodWe.
The grid frequency is outside the inverter's permissible range.
What to do
The inverter restarts automatically once the grid frequency returns to normal. If it's frequent — common when running off a generator — contact your network operator.
The inverter's grid relay failed its self-check.
What to do
Restart once. If it returns, the relay or power board needs replacement by a technician.
A communication error between the LCD/display and the master DSP.
What to do
Restart the inverter. If it persists, contact your installer or GoodWe.
The DC component of the AC output current exceeds the inverter's limit.
What to do
Restart the inverter. If the fault recurs, contact your installer or GoodWe.
Insulation resistance between the PV array and ground is too low — most common in rain or high humidity.
What to do
If it clears once dry, moisture is getting in. An installer should switch off the DC isolator and measure the impedance from PV+ and PV− to earth; if it's low, inspect the PV wiring insulation and MC4 connectors for water ingress. Don't keep resetting it.
The grid voltage is outside the acceptable range for the inverter.
What to do
Often self-restores when the grid returns to range. If it's frequent, your network voltage may be high — contact your installer or network operator; protection settings may need review (with the operator's consent).
The external cooling fan has faulted.
What to do
Check the fan and air vents for blockage. If the fan is faulty it needs replacement — contact your installer.
The PV array voltage exceeds the inverter's maximum input.
What to do
Switch off the DC isolator. The string likely has too many panels in series — your installer must re-check the string sizing against the inverter's maximum input voltage.
The inverter's operating temperature has exceeded its safe limit.
What to do
Improve ventilation per the install guidelines, keep the unit out of direct sun and confined spaces, and check the fans aren't blocked.
An internal cooling-fan fault (IFAN).
What to do
Restart once. If it persists, the internal fan needs service — contact your installer or GoodWe.
The internal DC bus voltage is too high.
What to do
Restart the inverter. If it recurs, contact your installer or GoodWe.
Residual-current (earth-leakage) protection has tripped — current is leaking to ground.
What to do
Switch off the DC isolator and have an installer inspect the PV string wiring insulation for wear or damage. If it persists after reconnection, call a specialist — don't keep resetting an earth fault.
Loss of connection between the inverter and the utility grid — an outage or a disconnection.
What to do
Check the Solar Supply Main Switch and the AC isolator are on, and confirm the grid is working. If the grid is fine and it persists, have an installer check the AC wiring.
The AC current sensor (HCT) has failed.
What to do
Restart once. If it remains, the current sensor needs service — contact your installer or GoodWe.
A failure in the leakage-current (GFCI) detection circuit.
What to do
Restart once. If it remains, the safety detection circuit is compromised and needs repair — arrange it promptly; don't ignore it.
The internal 1.5 V reference voltage is out of range.
What to do
Restart the inverter. If it persists, it needs servicing — contact your installer or GoodWe.
A missing or faulty protective-earth connection — possibly loose wiring, corrosion, or grounding-system damage.
What to do
This is an electrical-safety fault — have a licensed electrician diagnose and repair the grounding connection. Don't keep resetting it.
A general internal device failure (shown for faults outside the listed codes).
What to do
Restart the inverter once. If it persists, note the exact code shown and contact your installer or GoodWe.
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