Tigo EI - System Fault Codes

Reference – Error Codes
EI Residential Solar Solution US Installation Manual | www.tigoenergy.com | Help Center 65
System Fault Codes
Code #
Error Message
Description
Suggestions
201
Residual I high
Leakage current too high
Restart the inverter.
202
PV voltage high
The DC input voltage is exceeding
the maximum tolerable value.
1. Disconnect the DC switch
immediately.
2. Check the voltage of each PV string
with a multimeter.
203
PV isolation low
Insulation problem
1. Check if the panel enclosure is
grounded properly.
2. Check if the inverter is grounded
properly.
3. Check if the DC breaker is wet.
4. Check the impedance of PV + and
PV – between ground (>25KΩ or
550KΩ (VDE 0126)).
300
AC V out range
The utility grid voltage is out of
permissible range.
1. Switch off the DC disconnect.
2. Check AC wiring especially the
neutral and ground wires.
3. Verify grid voltage is within
tolerances.
4. Restart the inverter.
302
No AC
connection
No AC connection
The inverter does not detect grid
voltage.
1. Check AC wiring connections.
2. Check the status of the AC breaker.
303
PE abnormal
Neutral and PE voltages exceed
30V.
1. Check neutral and PE voltages.
2. Check AC wiring.
3. Restart the inverter.
304
AC F out range
Utility grid frequency out of
permissible range.
1. Switch off the DC disconnect.
2. Check AC wiring especially the
neutral and ground wires.
3. Verify grid frequency is within
allowable tolerance (59.3 to 60.8
Hz).
4. Restart the inverter.
407
Auto test failed
The EI Inverter initial auto test
has failed.
1. Restart the inverter.
2. Repeat auto test.
3. Check all connections and wiring.
4. Check DC, AC, and battery voltage
readings and if Grid selection in the
app matches the actual Grid reading.
5. Check the firmware version and
update if needed.
500
BMS COM fault
BMS not able to communicate
properly with the inverter.
1. Check RS485 cable connection.
2. Check if the battery is sleeping.