ID Name Severity Cause Solution
2062 Low
insulatio
n
resistanc
e
Major Cause ID = 1
● The PV array is short-
circuited with PE.
● The PV string has been
in a moist environment
for a long time and the
circuit is not well
insulated to ground.
1. Check the impedance
between the PV string and
the PE cable. If a short circuit
occurs, rectify the fault.
2. Check whether the PE cable
of the inverter is correctly
connected.
3. If you have
conrmed that
the impedance is lower than
the
specied protection
threshold in a cloudy or rainy
environment, log in to the
app, SmartLogger, or NMS
and set Insulation resistance
protection threshold.
2063 Cabinet
overtem
perature
Minor Cause ID = 1
● The inverter is installed
in a place with poor
ventilation.
● The ambient
temperature exceeds the
upper threshold.
● The inverter is not
operating properly.
1. Check the ventilation and
ambient temperature at the
inverter installation position.
2. If the ventilation is poor or
the ambient temperature
exceeds the upper threshold,
improve the ventilation and
heat dissipation.
3. If both the ventilation and
ambient temperature meet
requirements yet the alarm
persists, contact your dealer
or Huawei technical support.
2064 Device
fault
Major Cause ID = 1–15
An unrecoverable fault
occurs on a circuit inside
the inverter.
Turn o the AC output switch
and DC input switch, and then
turn them on after 5 minutes. If
the alarm persists, contact your
dealer or Huawei technical
support.
NOTICE
Cause ID = 1: Perform the preceding
operations when the PV string
current is less than 1 A.
2065 Upgrade
failed or
version
mismatc
h
Minor Cause ID = 1–6
The upgrade is not
completed normally.
1. Perform an upgrade again.
2. If the upgrade fails several
times, contact your dealer or
Huawei technical support.
SUN2000-(20KTL, 29.9KTL, 30KTL, 36KTL, 40KTL)-
M3
User Manual 8 Maintenance
Issue 11 (2023-01-10) Copyright © Huawei Technologies Co., Ltd. 80
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