Goodwe Inverter Fault Codes
GoodWe inverter fault codes
Find your message and understand the next step. Practical help for solar owners in Redlands and Brisbane Bayside.
Call 0405 685 441Send us your fault detailsMost entries below refer to the GoodWe DNS Series manual V1.6 (2022). PE Loss is separately scoped to the DNS G4 manual V1.6 (2026). They are not a universal table for MS, XS, hybrid or every DNS generation. Match your model and complete display wording before relying on a meaning.
Find your message
PE Loss
Fault messages · DNS G4 manual V1.6, 2026-04-15, F145. Do not assume this mapping covers older DNS, MS, XS or hybrid models.
What it means
Protective earth is not connected.
Your next step
Arrange prompt assessment by a licensed electrician. Keep clear of the equipment; this requires an electrical check, not an app setting.
Isolation Fail
Fault messages · DNS Series manual V1.6, 2022-01-20, sections 5.3 and 6. Display wording varies; this is not a universal GoodWe code table.
What it means
Insulation resistance to earth is too low.
Your next step
Contact a licensed solar electrician promptly. Note if it happens after rain; a warning disappearing in dry weather does not establish that the fault is fixed.
Ground I Fail
Fault messages · DNS Series manual V1.6, 2022-01-20, sections 5.3 and 6. Display wording varies; this is not a universal GoodWe code table.
What it means
Current to earth is too high.
Your next step
Arrange a licensed solar electrician’s assessment. Note the exact message and when it appeared. Leave testing and identifying the affected circuit to the electrician.
Vac Fail
Fault messages · DNS Series manual V1.6, 2022-01-20, sections 5.3 and 6. Display wording varies; this is not a universal GoodWe code table.
What it means
Grid voltage is outside the permitted range.
Your next step
Note when it happens and whether mains power is affected. If it repeats or generation does not resume after supply returns, ask your installer to investigate.
Fac Fail
Fault messages · DNS Series manual V1.6, 2022-01-20, sections 5.3 and 6. Display wording varies; this is not a universal GoodWe code table.
What it means
Grid frequency is outside the permitted range.
Your next step
Note the time and any local outage. The inverter may recover when supply conditions return to normal; repeated events need installer assessment.
Utility Loss
Fault messages · DNS Series manual V1.6, 2022-01-20, sections 5.3 and 6. Display wording varies; this is not a universal GoodWe code table.
What it means
The inverter is not detecting an available grid supply.
Your next step
Check outage information online and note whether the house also lost power. If normal mains supply is available but this continues, contact your installer.
PV Over Voltage
Fault messages · DNS Series manual V1.6, 2022-01-20, sections 5.3 and 6. Display wording varies; this is not a universal GoodWe code table.
What it means
DC input voltage is too high.
Your next step
Contact a licensed solar electrician promptly. They need to assess the array and inverter together before deciding what repair or configuration change is needed.
Over Temperature
Fault messages · DNS Series manual V1.6, 2022-01-20, sections 5.3 and 6. Display wording varies; this is not a universal GoodWe code table.
What it means
The inverter has detected excessive internal temperature.
Your next step
From safe access, note hot weather, direct sun and objects around the inverter. If it repeats, arrange assessment of the installation and cooling. Do not move or open the inverter.
What to send us
The full message, inverter model, when it first appeared, whether it repeats, and any rain, storm or outage around that time. Use an installation document or app for the model if the equipment label is not safely accessible.
Not every fault needs a replacement inverter. An assessment helps distinguish an inverter issue from an array, wiring, grid or monitoring issue before you decide on the work.
Need help with your solar system?
Send the fault details to Solair Electrical and we can discuss the next step for your Redlands or Brisbane Bayside property.
Call 0405 685 441Request an assessmentExplore solar inverter repairs or return to the Solair Electrical homepage.
Sources and model scope
Manufacturer references support the stated model scopes, not every model sharing a brand name. Technical procedures in manufacturer documents are not homeowner instructions.