58
E171
Anti-freezing Protection
inlet water ≤A04
℃
and the
antifreeze temp
≤
A04-A05
℃
1. Check the water flow.
2. Check the outlet water temp sensor.
3. Measure the ambient temp.
4. Detect the connection of cables.
5. Check the record of defrosting, whether the defrosting time is too long or too often.
F01
Compressor activation failure
Restart the unit.
1. Check the changing process of EEV step, high pressure, low pressure, inlet/outlet water temp.
2. Check the connection of U/V/W between compressor and compressor driver board.
3. Check the compressor resistance.
4. Check compressor driver board.
F03
PFC Fault
Restart the unit.
1.Check the power supply connection and voltage supply is stable or not.
2.Replace a new compressor driver board.
F05
DC Bus Over voltage
1.Check the voltage between DCP-IN and DCN-IN, if lower than 300V, the unit will get this protection.
2.Check the input voltage of R/S/T on compressor driver board, if lower than 210V, the unit will get this
protection.
3.If they are OK, please replace a new compressor driver board.
F06
DC Bus Under voltage
1.Check the voltage between DCP-IN and DCN-IN, if lower than 300V, it will get this protection;
2.Check the input voltage of R/S/T on compressor driver board, if lower than 210V, it will get this protection;
3. If they are OK, please replace a new compressor driver board
F07
AC Input Under voltage
1. Measure the input voltage of R/S/T of driver board, if lower than 300V, it will get this protection.
2. If it’s OK, replace a new compressor driver board.
F08
AC Input Over current
Only in single phase unit. Restart the unit. Check if there is electric leakage. If not, replace a new drive
board.
F09
Input voltage sampling fault
1. Make sure power supply not lower than 300V or higher than 500V;
2. If it’s OK, please replace a new compressor driver board.
F10
Communication Failure between
DSP and PFC
Only in single phase unit.
1. Check the inverter board connection.
2. If no problem, replace a new compressor driver board.
F11
Communication Fault between DSP
and Communication board
1. Please check the inverter board connection.
2. If no problem, please replace a new compressor driver board
F12
Communication failure between PCB
and driver board
1. Check the connection between main control board and compressor driver board. All of 12V-12V,
GND-GND, A-A, B-B should be closed.
2. If they are closed, turn on the power, then measure the voltage between 12V and GND on compressor
driver board, if higher than 15V or lower than 7V, please replace a new one compressor driver board.
