Hybrid Inverter User Manual
© 2022 Hoymiles Power Electronics Inc. All rights reserved.
29
Display
Possible Cause
Handling Suggestions
Over Temperature
The temperature inside the inverter
is higher than the permissible
range.
1. Make sure that the installation complies with the
instructions from User Manual.
2. Check whether the alarm “Fan Fault” occurs. If so,
replace the faulty fan.
3. If the alarm persists, contact Hoymiles technical
support team.
Isolation Fault
The ground insulation impedance
of the PV string is too low.
1. Use a multimeter to determine if the resistance
between the earth and the inverter frame is close to zero.
If not, please ensure that the connection is good.
2. If the humidity is too high, an isolation fault may occur.
Attempt to restart the inverter. If the fault persists, check
it again when the weather turns fine.
3. Check the resistance to ground from the PV module/
cable. Take corrective measures in case leading to a short
circuit or damaged insulation layer.
4. If the alarm persists, contact Hoymiles technical
support team.
Arc Fault
The inverter detects that there is
an arc fault.
1. Disconnect the DC switch and check whether DC cables
are damaged and whether the wiring terminals are loose
or in poor contact. If so, take corresponding corrective
measures.
2. After taking corresponding measures, reconnect the
DC switch.
3. If the alarm persists, contact Hoymiles technical
support team.
EPS Load
Overpower
The EPS load power is higher than
the permissible range.
1. Reduce the power of EPS loads, or remove some EPS
loads. The inverter will restart automatically.
2. If the alarm persists, contact Hoymiles technical
support team.
Meter Reverse
Connection
The inverter detects that the Meter
or CT is reverse connected.
1. Make sure that the installation complies with the
instructions from User Manual.
2. If the alarm persists, please contact Hoymiles technical
support team.
Meter
Communication
Fault
The inverter detects that there
is a meter communication fault.
1. Check whether the Meter communication cable and
terminal are abnormal.
2. Reconnect the Meter communication cable.
3. If the alarm persists, please contact Hoymiles technical
support team.
Battery Reverse
Connection
The inverter detects that the
battery wirings are reversely
connected.
1. Check the battery for polarity correctness, and correct
it if necessary.
2. If the alarm persists, please contact Hoymiles technical
support team.
Battery Voltage
Fault
The battery voltage is higher than
the permissible range.
1. Check if the battery input voltage is within the normal
range.
2. If the alarm persists, please contact Hoymiles technical
support team.
BMS
Communication
Fault
The inverter detects that there is a
BMS communication fault.
1. Check whether the BMS communication cable and
terminal are abnormal.
2. Reconnect the BMS communication cable.
3. If the alarm persists, please contact Hoymiles technical
support team.
