HMS-600W / 800W USER MANUAL 18
9. TROUBLE SHOOTING
Full Error Code and Corrective Measures
When the PV system does not operate normally, we recommend the following solutions
for quick troubleshooting. If an error occurs, the Error code will be displayed on the
inverter’s screen or on the Hypontech’s monitoring App/Web, the red LED will light up.
The corresponding corrective measures are as follows:
Error Code
Fault Name Description Corrective Measures
1
Functional fault in
Micro-Controller
Unit (MCU)
MCU abnormal self-check in
start process
Disconnect the inverter from the utility grid and the PV array, and
reconnect it after LED turns off.
If this fault is still being displayed, please contact service.
2
A faulty current
sensor detected
AC current sensor detect
current abnormal in the start
process
Disconnect the inverter from the utility grid and the PV array, and
reconnect it after LED turns off.
If this fault is still being displayed, please contact service.
4
A faulty grid relay
detected
The difference between INV
voltage and output voltage
exceeds limit.
1. Disconnect the inverter from the utility grid and the PV array,
and reconnect it after LED turns off.
2. If the fault persists, measure the phase to phase voltage and
phase to zero and zero to ground voltage with a multimeter to
ensure that the voltage is normal and the zero to ground
voltage value should not be greater than 10V.
3. Disconnect the inverter from the utility grid and the PV array,
and reconnect it after LED turns off.
If this fault is still being displayed, please contact service.
5 PV voltage too high
When the PV voltage of any
circuit is greater than 60V, it
is determined as the PV
voltage is too high.
Check the open-circuit voltages of the strings and make sure it is
below the maximum DC input voltage of the inverter. If the input
voltage lies within the permissible range while the fault occurs,
please contact the service.
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