Sunsynk F58 fault: BMS communication fault
Call a qualified installer
Urgency: medium
What it means
The inverter lost communication with the battery's management system (BMS), so it can't safely control charging. Don't change protection settings – an installer needs to check the battery link.
Likely causes
- Battery communication link lost
- Battery BMS settings mismatch
- Battery fault
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.