Error Codes & Troubleshooting

The digital multimeter can check MOS status quickly. Here is one example to show how to test it as follows:

Materials/Tools： MOS & Multimeter

Instruction
1. The testing method of N channel MOSFET:
Turn the multimeter to the diode gear wheel.
2. Steps
Use the diode gear wheel to test G-S poles of 5N60C forward direction.
The red side of the multimeter to G, Black side to S, if the data on multimeter is OL, the Mosfet is good without damage.
Use the diode gear wheel to test D-S poles of 5N60C at opposite direction.
If the red side of the multimeter to S, the black side to D, and the data on multimeter is between 0.45-0.65vdc，the Mosfet is good without damage.
If the test data on multimeter is close to 0, it means the mosfet get damaged.
When charge the capacitance between poles G and S with the diode gear wheel of multimeter, for N channel mosfet charging, the red side of multimeter to G pole, and the black side to G pole.
After testing the D and S pole of 5N60C and confirm they are OK, then charge the gate-source capacitance of the mosfet with the diode gear wheel of multimeter.
As the input resistance of the MOSFET is in the GΩ level ( 1GΩ =1000MΩ ), the open-circuit voltage of the diode gear wheel of multimeter is 2.8-3V, after the gate-source capacitance being charged, the resistance between D and S pole of mosfet becomes very small, and can test if pole G and S get damaged.
Kind reminder:
Above test method is the way to test N channel Mosfet.
For P channel mosfet, test method is the same, just exchange the polarity of test lead of the multimeter.

Error code 01: Fan problem (Fan is locked when inverter is turned off)

Disconnect the load, grid input and solar input,just connect with battery and turn on the inverter. If still problem, then
Check if the fan works or not. If fans doesn’t run, check if anything block the fan. If the fan is blocked and doesn’t run, then
Disconnect the input power source, open the cover, and check if the fan wire is well connected or get loosed. If get loosed, make the well connected. If there is nothing block the fan and wires are well connected,
fan stil not run, then
If step 1-3 have been well checked and the fan still not work, replace the fan (The replacing fan must have the same model)

Error code 02 : Over Temperature or Over Load.

If you are using Inverter 1.4KW then your load must be between 1 – 700KW. (you may increase the load if and only if you have more Amp getting from Solar Panels.

Note: You must install your inverter in ground floor is much better to install your inverter in top floor. This is because on the top floor heat temperature is very high rather than ground floor.

Error code 03: Battery voltage is too high

Check if the battery well connected. (For example: if the inverter battery voltage is 24vdc,should use 2pcs*12V battery is series connection. If your inverter battery input voltage is 48vdc, should use 4pcs*12V battery in series connection.)

Error code 04: Battery voltage is too low and load is too high.

Disconnect the load, grid input and solar input. Just connect battery and turn on the inverter, Check the battery votlage, if the battery votlage is too low ( For example, for 3k system,if the battery voltage is lower than 24Vdc. For 5k system, if the battery voltage is lower than 48Vdc), charge the battery in time is OK.

Problem description: Disconnect the load, grid input and solar input. Just connect battery, turn on the inverter and everything is ok without load. When connect with load, the inverter gives alarm for the lower battery voltage.
Solution: Check if the battery problem or if the battery is well connected, just replace the battery or re-connect the cable.

Error code 05: output short-circuit or over temperature detected in inverter inner components.

Disconnect the load, grid input and solar input Just connect battery and turn on the inverter after 5 minutes. If the inverter can be turned on, please reduce parts of the load. If still problem, then
Disconnect all power source, and open the top cover,take out the main-board, place the main board
on the insulated tables, connect with DC power source (Suggest control the max current at 5A). Upturn the main-board and test the voltage of DC-AC drive power supply circuit . Switch the multimeter to the DC gear wheel, the red test lead to the negative pole of zener diode , and the black test lead to the positive pole of zener diode. If everything is ok, then
Disconnect all power source, test the DC to AC Mosfet (or IGBT) and related drive resistance. If damaged, replaced them.

Error code 06: Output voltage is abnormal for 1K/2K/3K model; Output voltage is too high for 4K/5K model

Disconnect the load, grid input and solar input Just connect battery and turn on the inverter.If still
problem, go for step 2.
Step 2. Disconnect all power source, and open the top cover, take out the main board, place the main board
on the insulated tables, connect with DC power source (Suggest control the max current at 5A). Upturn the
main-board and test the voltage of DC-AC drive power supply circuit. Switch the
multimeter to the DC gear wheel, the red test lead to the negative pole of zener diode , and the black test
lead to the positive pole of zener diode. If everything is ok, go for step 3.
Step 3. Disconnect all power source, test the DC to AC Mosfet (or IGBT) and related drive resistance. If
damaged, replaced them.

Error code 07: Overload time out

Disconnect the load, grid input and solar input. Just connect battery and turn on the inverter.If still
problem, go for step 2.
Step 2. Disconnect all power source, and open the top cover, take out the control board, place the control
board on the insulated tables,
Test the output sampling circuit with multimeter, and replace the damaged
components or control board.

Error code 08: Bus voltage is too high

Disconnect the load, grid input and solar input. Just connect battery and turn on the inverter.If still
problem, go to step 2.
Step 2. Check if the battery voltage and solar input voltage is too high, and if they are connected correctly. If
their input voltage is in the proper range and OK, go to step 3.
Step 3. Disconnect all power source,and open the top cover, take out the main board, place the main board
on the insulated tables. Test the DC to AC drive circuit with multimeter, and replace
the damaged components.

Error code 09: Bus soft start failed

Turn the multimeter rotary knob to diodes and resistance location, to test the Mosfets and drive resistor in main
board’s invert circuit, see if they are burnt or damaged.

Turn the multimeter rotary knob to resistance location, to test the BUS soft start parts if any been burnt or
damaged.

Use multimeter to test the MPPT parts.

Error code 11 :  Main relay failed

Disconnect the load, grid input and solar input. Just connect battery and turn on the inverter.If problem is still, then
Disconnect all power source,and open the top cover, take out the main board, place the main board on the insulated tables. Replace the main replay .

Error code 51:   Over current or surge

Disconnect the load, grid input and solar input. Just connect battery and turn on the inverter.If still problem, then
Disconnect all power source,and open the top cover, take out the main board, place the main board on the insulated tables. Check OP07 integrated circuit and related components. If any damage, replace them.

Error code 52, Bus voltage is too low

Disconnect the load, grid input and solar input. Just connect battery and turn on the inverter.If still problem, then
Check the battery voltage, if the battery voltage is too low ( lower than 24v for 3k, and lower than 48v for 5K.), charge the battery in time. If still problem, then
Disconnect all power source,and open the top cover, take out the main board, place the main board on the insulated tables. Check bus voltage and check the circuit resistance with multimeter . If any damage, replace them.  If ok then
Test the DC-DC MOS and Isolated drive circuit with multimeter, replace the damaged componets

Error code 53 :  Inverter soft start failed

Disconnect the load, grid input and solar input. Just connect battery and turn on the inverter.If still problem, then
Disconnect all power source,and open the top cover, take out the main board, place the main board on the insulated tables. Check the DC to AC mosfet and drive circuit with multimeter . If any damage, replace them.

Error code 55 : Over DC voltage in AC output

Disconnect the load, grid input and solar input. Just connect battery and turn on the inverter.If still problem, then
Disconnect all power source,and open the top cover, take out the main board, place the main board on the insulated tables. Check the BUS synchronous rectification MOS and related the drive circuit with multimeter . If any damage, replace them.
MOS of synchronous rectification the drive circuit of synchronous rectification.

Error code 56 : Battery connection is open

Check if the battery cables well connected.

Error code 57 : Current sensor failed

Disconnect the load, grid input and solar input. Just connect battery and turn on the inverter.If still problem, then
Disconnect all power source,and open the top cover, take out the main board, place the main board on the insulated tables. Check the the DC to AC MOS sampling circuit . If any damage on OP07 integrated circuit or other components, replace them.

Error code 58 : Output voltage is too low

Disconnect the load, grid input and solar input. Just connect battery and turn on the inverter.If the problem is still occurring then,
Check the battery voltage, if the battery voltage is too low ( lower than 24v for 3k, and lower than 48v for 5K.), charge the battery in time. If the problem is still occurring then,
Disconnect all power source,and open the top cover, take out the main board, place the main board on the insulated tables. Test the DC to DC, DC to AC MOS and Isolated drive resistance with multimeter, replace the damaged components.