29
E103
Fan motor overload
protection
1. Check if the fan motor running well.
2. Detect the current of fan motor.
3. If the current is more than 1A, it means the
motor have problem and need to replace a new
one.
4. If the current is less than 1A, it means the motor
control module have problem and nee to replace a
new one.
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. 2.Replace a new compressor driver board.
F05
DC Bus Overvoltage
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
Undervoltage
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
Undervoltage
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.
