Sunsynk F42 fault: Grid voltage low
Keep an eye on it
Urgency: low
What it means
The grid voltage dropped below what the inverter accepts. This is usually a municipal supply issue rather than a problem with your system.
Likely causes
- Low municipal voltage in the area
- Grid recovering after load-shedding
What you can safely check
- Ask neighbours whether they also have power problems and check municipal notices.
- Check whether load-shedding or a municipal outage is affecting your area.
- If it keeps coming back, stop and call a qualified installer.
When to call a pro
If it doesn't clear on its own, happens often, or comes with burning smells, heat or noise, call a qualified installer.
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.