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PFC module thermal circuit is
abnormal
PFC module high temperature
protection
Input power failure
Software control exception
Current detection circuit failure
Compressor start failure
Ambient Temperature device failure
on Driver board
Compressor phase failure
Four-way valve reversal failure
EEPROM data read malfunction
The inter-chip communication failure
on the main control board
EE18
The driver board is damaged
1. PFC module thermal circuit output
abnormal
2. Motor is abnormal or damaged
EE19
3. Fan blade is broken
4. The screw in the driver board is
not tight
The supply voltage fluctuates too
EE20
much
1.Compressor runs out of step
2. Wrong program
EE21
3. Impurity inside compressor causes
the unstable rotate speed
1. Voltage signal abnormal
2. Driver board is damaged
EE22
1. Main board is damaged
2. Compressor wiring error or poor
contact or unconnected
3. Liquid accumulation inside
EE23
4. Wrong phase connection for
compressor
EE24
Ambient Temperature device failure
Compressors U, V, W are connected
EE25
to one phase or two phases.
1. Four-way valve reversal failure
2. Lack of refrigerant (no detect when
EE26
T3 or T5 malfunction)
1. Wrong EEPROM data in the
program or failed input of EEPROM
EE27
data
2. Main board failure
EE28
Main board failure
67
1. Change a new driver board
2. Check if the fan motor speed is too
low or fan motor damaged, change
another one
1. Change a new driver board
2. Check if the motor speed is too
low or fan motor damaged, change
another one
3. Change another fan blade
4. Check if the screw is loose
Check whether the voltage is stable
1. Check the main board or change a
new one
2. Enter correct program
1. Check the main board or change a
new one
2. Change a new driver board
1. Check the main board or change a
new one
2. Check the compressor wiring
according to the circuit diagram
Check the compressor or change a
new one
Change driver board or main board
Check the actual wiring according to
the circuit diagram
1. Switch to Cooling mode to check
the 4-way valve if it has been
reversed correctly
2. Change a new 4-way valve
3. Fill with gas
1. Re-enter correct EEPROM data
2. Change a new main boar
1. Turn off electricity supply and
restart it
2. Change a new main board
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