Sunsynk F13 fault: Working mode change
Safe to check yourself
Urgency: low
What it means
The inverter noticed that its operating mode changed – for example the grid type or frequency setting, the battery being set to “no battery”, or a work-mode change on older firmware. It usually clears by itself.
Likely causes
- Grid type or frequency setting changed
- Battery type set to “no battery”
- Work-mode change on older firmware
- Brief grid disturbance
What you can safely check
- Wait a few minutes – this message often clears by itself.
- Restart the inverter using its documented procedure: switch it off, wait one minute, then switch it on again.
- If it keeps coming back, stop and call a qualified installer.
When to call a pro
If the safe checks don't clear it, or it keeps coming back, 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.