55 PB
TROUBLESHOOTING
Outdoor Unit
Diagnostic Codes _ Unit Not Running
When the unit has the following trouble and the compressor stops running, The LED of outdoor control board will show the error sequence automati-
cally:
Outdoor Failure Description LED1 LED2 LED3 the root cause my be one of the following
Mark description: the lights ash every two seconds for the following faults
Outdoor coil temperature sensor faulted ON OFF ON a. The outdoor coil sensor connector loose.
b. The outdoor coil temperature sensor failed.
c. The outdoor control board failed.
Compressor exhaust temperature
sensor faulted
ON OFF OFF a. The compressor exhaust temperature sensor connector loose.
b. The compressor exhaust temperature sensor failed.
c. The outdoor control board failed.
Communication failure between the
indoor unit and outdoor unit
OFF OFF BLINKS a. The communication cable connector loose.
b. The communication cable failed.
c. The connection between the filter board and the outdoor control board is incorrect
or loose.
d. The connection between the filter board and the terminal is incorrect or loose.
e. The indoor control board failed.
f. The PFC board failed.
g. The power board failed.
h. The outdoor control board failed.
Current overload protection ON BLINKS OFF a. The fan motor run abnormally.
b. The condenser and evaporator is dirty.
c. The air inlet and outlet is abnormal.
Maximum current protection ON BLINKS ON a. The outdoor control board is short circuited.
b. The drive board is short circuited.
c. The other components are short circuited.
Communication error between outdoor
unit and driver
OFF ON ON a. The connection wires are loose.
b. The outdoor board or drive board failed.
Outdoor EEPROM faulted ON ON ON a. The EEPROM chip is loose.
b. The EEPROM chip inserted in wrong direction.
c. The EEPROM chip failed.
Compressor exhaust temperature too
high protection
OFF BLINKS ON a. The compressor exhaust temperature sensor failed.
b. The refrigerant of the unit is low.
Outdoor ambient temperature sensor
faulted
ON ON OFF a. The outdoor ambient temperature sensor connecter loose.
b. The outdoor ambient temperature sensor failed.
c. The outdoor control board failed.
Compressor shell high temperature
protection
OFF ON BLINKS a. The compressor exhaust temperature sensor connector loose.
b. The refrigerant of the unit is low.
Anti-freeze protection with cooling or
overload protection with heating in
indoor unit
OFF BLINKS BLINKS a. The indoor coil temperature sensor connector loose.
b. The indoor coil temperature sensor failed.
c. The indoor control board failed.
d. The refrigerant system is abnormal.
Compressor drive faulted BLINKS OFF BLINKS a. The outdoor drive board failed.
b. The compressor failed.
c. The outdoor control board failed.
Outdoor fan motor locked rotor
protection
BLINKS BLINKS ON a. The connection of the outdoor fan motor is loose.
b. There is something blocking the outdoor fan.
c. The fan motor failed.
d. The outdoor control board failed.
Outdoor coil anti-overload protection with
cooling
OFF ON OFF a. There is too much refrigerant.
b. The outdoor fan motor failed.
c. The outdoor fan is broken.
d. The condenser is dirty.
e. The air inlet and air outlet of the indoor unit and the outdoor unit is not
normal.
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