PFC module high
temperature protection
1. PFC module thermal circuit output
abnormal
2. Fan motor is abnormal or damaged
3. Fan blade is broken
4. The screw in the driver board is not
tight
1. Check the main board or replace the
driver board
2. Check if the motor speed is too low
or fan motor is damaged, replace it by a
new one if any failure.
3. Change the fan blade if it is broken
4. Check the screw on driver board
The supply voltage fluctuates too much
Check whether the voltage is stable
Software control
exception
1. Compressor runs out of step
2. Wrong program
3. Impurity inside compressor causes the
unstable rotate speed
1. Check the main board or change a
new one
2. Update the correct program
3. Check the refrigeration system
Current detection
circuit failure
1. Voltage signal abnormal
2. Driver board is damaged
3. Main board failure
1. Change a new main board
2. Change a new driver board
1. Main board is damaged
2. Compressor wiring error or poor
contact or unconnected
3. Liquid accumulation inside
4. Wrong phase connection for
compressor
1. Check the main board or change a
new one
2. Check the compressor wiring
according to the circuit diagram
3. Check the compressor or change a
new one
Ambient Temperature
device failure on Driver
board
Ambient Temperature device failure
Change driver board or main board
Compressors U, V, W are just connected to
one phase or two phases.
Check the actual wiring according to the
circuit diagram
EEPROM data read
malfunction
1. Wrong EEPROM data in the program or
failed input of EEPROM data
2. Main board failure
1. Re-enter correct EEPROM data
2. Change a new main board
The inter-chip
communication failure
on the main control
board
1. Stop electricity supply and restart it
2. Change a new main board
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