Sunsynk F08 fault: GFDI relay failure
Call a qualified installer
Urgency: medium
What it means
The inverter's ground-fault protection relay did not pass its self-test. This is a safety circuit, so the inverter won't work normally until it is checked.
Likely causes
- Faulty ground-fault relay inside the inverter
- Earth fault on the solar panel side
Don't try to fix this yourself
When to call a pro
Call a qualified installer now. Switch off heavy loads and don't try to repair anything yourself.
Solar systems carry dangerous voltages. Only do the safe checks listed. If unsure, call a pro.
Source: Deye Hybrid Inverter User Manual SUN-3K…6K-SG04LP1-EU, section 7 “Fault information and processing” (paraphrased)
Sunsynk inverters are built on the Deye platform and use the same F-codes. Check your Sunsynk manual if anything differs.