2. Open the front cover of the inverter to check if the NTC cable is well connected.there
are four NTC inside，there is special software can help locate which NTC is broken.
3. If the NTC cable is firm and the error code is still shows on the LCD, replace
the inverter.
4. Check if the air flow of the unit is blocked or the ambient temperature is too high.
4. 3 Error 03
Fault description: Battery voltage is too high
Analysis：
1. It may be that the battery voltage is not within the specified range, please refer to user
manual
2. It may be that the connection line of the battery is not firm, or the distance is too far, and
the line is too small, causing excessive impedance on the line when charging, and the
machine detection port voltage is too high.
3. Battery is over-charged.
4. The battery voltage is too high.
Suggestion:
1. Check if the battery voltage is normal by multi-meter.
2. If the actual value is higher than 60V, replace the battery.
3. Check if spec and quantity of batteries meet requirements.sometimes customer
connect 24V battery with 48V inverter model，please make sure the voltage is suitable.
4.4 Error 04
Fault description: Battery voltage/soc is too low.
Analysis：
3. It may be that inverter communication protocol is different from lithium icon battery
communication protocol，only some models of Pylon、Dyness brand lithium icon battery
can build communication with our inverter.
4. it may be that battery discharge too much，battery voltage is really low.
Suggestion:
2. if use lithium icon battery that can build communication with inverter，but still warn 04
fault，normally this fault comes with 20 fault，please arrange to upgrade inverter software
using ISP tool program software.
inverter new firmware software version：F2809_GW500.07_20191227_B.
inverter new BMS software version：F030_sk022_05_20191220.
please don’t forget to reset factory setting after upgrading every software.
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