Growatt WIT 50-100K-US - Troubleshooting; Warning

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9.2 Troubleshooting
● It must be operated by trained and professional electrical technicians.
Technicians must observe instructions in this manual and local regulations.
● If the WIT Inverter reports the “PV Isolation low” alarm, do not touch the
equipment as a ground fault might have occurred.
● Beware of high voltages which can cause electric shocks.
9.2.1 Warning
Warnings indicate abnormal situations of WIT 50-100K Storage/Hybrid Inverters, leading to a
reduction in the output power. The warning sign will disappear once the fault is rectified by
restarting the inverter or reconfiguring the system. The warning codes are shown in Table 9.1:
Table 9.1Warning codes
Warning
Description
Suggestion
Warning 200
String fault
1. Check if the PV panels are normal after
shutdown.
2. If the error message persists, contact Growatt
support.
Warning 201
PV string/PID quick-connect
terminals abnormal
1. Check the wiring of the string terminals after shutdown.
2. If the error message persists, contact Growatt support.
DC SPD
Warning
DC SPD function abnormal
1. Check the DC SPD after shutdown.
2. If the error message persists, contact Growatt support.
Warning 203
PV1 or PV2 short circuited
1. Check if PV1 or PV2 is short circuited.
2. If the error message persists, contact Growatt support.
Boost
Warning
PV Boost driver abnormal
1. Restart the inverter.
2. If the error message persists, contact Growatt support.
AC SPD
Warning
AC SPD function abnormal
1. After shutdown, check the AC SPD.
2. If the fault persists, contact Growatt.
Warning 208
DC fuse blows
1. Power off the system and check the fuse.
2. If the fault persists, contact Growatt.
Warning 209
DC input voltage exceeds the
upper threshold
1. Turn off the DC switch immediately and check the DC
voltage.
2. If the DC voltage is within the specified range and the
error message persists, contact Growatt support.
PV Reversed
PV string is reversely connected
1. Check the polarity of the PV terminals.
2. If the error message persists, contact Growatt support.
Warning 219
PID function abnormal
1. Restart the inverter.
2. If the error message persists, contact Growatt support.
Warning 220
PV string disconnected
1. Check if the PV string is properly connected.
2. If the error message persists, contact Growatt support.
Warning 221
PV string current unbalanced
1. Check if the PV panels of the corresponding string are
normal.
2. If the error message persists, contact Growatt support.