© 2022 Hoymiles Power Electronics Inc. All rights reserved.
17
Single-phase Microinverter HMS-700/800/900/1000-2T-NA
6. Troubleshooting
6.1 Troubleshooting List
Code
Alarm
range
Alarm status
Handling suggestions
121
Over temperature
protection
1. Check the ventilation and ambient temperature at the
microinverter installation location.
2. If the ventilation is poor or the ambient temperature exceeds
the limit, please improve the ventilation and heat dissipation.
3. If the problem persists when ventilation and ambient
temperature are appropriate, contact your dealer or Hoymiles
technical support team.
124
Shut down by remote
control
1. Check the status of zero export management and whether
the microinverters were manually shut down.
2. If the alarm still persists, please contact your dealer or
Hoymiles technical support team.
125
Grid configuration
parameter error
1.Check if the grid configuration parameter is correct and
upgrade.
2. If the fault still exists, contact your dealer or Hoymiles
technical support team.
127
Firmware error
1.Check if the firmware is correct and has been upgraded.
2.Check the communication between DTU and Hoymiles
monitoring system, and between DTU and microinverter. Then
try again.
3. If the fault still exists, contact your dealer or Hoymiles
technical support team.
129
Abnormal bias
1. If the alarm occurs occasionally and the microinverter can
still work normally, no special treatment is required.
2. If the alarm occurs frequently and cannot be recovered,
contact your dealer or Hoymiles technical support team.
130
Offline
1.Please make sure that the microinverter works normally (check
if the DC voltage is within normal range and confirm the status
of the LED indicator).
2.Check if the SN on microinverter label is the same as on the
monitoring platform.
3.Check the communication status between the DTU and
Hoymiles monitoring system, and between the DTU and the
microinverter. If the communication is poor, try to make some
improvements.
4. If the alarm occurs frequently and cannot be recovered,
contact your dealer or Hoymiles technical support team.
141
Grid
Grid overvoltage
1. If the alarm occurs occasionally, the grid voltage may be just
abnormal temporarily. The microinverter can automatically
recover after grid voltage becomes normal.
2. If the alarm occurs frequently, check whether the grid voltage
is within the acceptable range. If not, contact the local power
operator or change the grid overvoltage protection limit in the
grid profile via Hoymiles monitoring system with the consent of
the local power operator.
142
Grid
10 min value grid
overvoltage
1. If the alarm occurs occasionally, the grid voltage may be just
abnormal temporarily. The microinverter can automatically
recover after grid voltage becomes normal.
2. If the alarm occurs frequently, check whether the grid voltage
is within the acceptable range. If not, contact the local power
operator or change the grid overvoltage protection limit via
Hoymiles monitoring system with the consent of the local
power operator.
Troubleshooting
