9 Troubleshooting and Maintenance
User Manual
46
Fault
Code
Description
Troubleshooting
019
The
transient
bus
voltage is high.
1. Wait a moment for inverter recovery.
2. If the fault occurs repeatedly, contact
Sungrow Service Dept.
020
The bus voltage is high.
1. Wait a moment for inverter recovery.
2. If the fault occurs repeatedly, contact
Sungrow Service Dept.
021
PV1 input overcurrent is
detected
Check the layout and the wiring of PV1 input.
022
PV2 input overcurrent is
detected
Check the layout and the wiring of PV2 input.
028
PV1 reverse connection
fault
Check the cable connections of PV1.
029
PV2 reverse connection
fault
Check the cable connections of PV2.
036
The temperature of
radiator is too high
1. Check whether the ambient temperature
shown on the screen is too high. Wait a
moment for inverter recovery.
2. Check whether there is enough space for
convection.
3. Check whether the inverter is in direct
sunlight.
4. Check whether the fan is normal. Replace it
if necessary.
5. Clean the air inlets.
6. If the fault still exists, please contact
Sungrow.
037
The
internal
temperature of inverter
is too high
038
Relay fault is detected
1. Wait a moment for inverter recovery.
2. If the fault occurs repeatedly, contact
Sungrow Service Dept.
039
The insulation resistance
is low. (ISO-flt)
1. Check whether there is a reliable inverter
grounding line.
2. Check whether the positive and negative of
PV panels is short-circuited with ground lead.
3. Wait a moment for inverter recovery.
4. If the fault occurs repeatedly, contact
Sungrow Service Dept.
041
Leakage current self-test
abnormality
1. Wait a moment for inverter recovery.
2. If the fault occurs repeatedly, contact
Sungrow Service Dept.
043
Ambient temperature is
too low, below -30
℃
Shut down and disconnect the inverter.
Wait until the ambient temperature rises to
the permissible range and restart the inverter.
044
Open-loop
inverter
self-test fault
1. Wait a moment for inverter recovery.
2. If the fault occurs repeatedly, contact
