2. Pull out the sensor plug and measure the resistance of the sensor to see
if there is a short circuit or open circuit (the sensor is a 5K temperature
sensor). If the sensor is short circuited or open, replace the sensor,
otherwise replace the PCB.
1. Observe whether the EEPROM has burnt black, weak solder, or poor
contact;
2. Pull out the EEPROM and re-insert it;
3. Replace EEPROM or replace the PCB.
Fan motor stall
protection
1. Check whether the plug on the IDU PCB is loose, if it is loose, plug it
in tightly, otherwise proceed to the next inspection;
2. Check whether the motor coil of the indoor unit is open or short-
circuited. Turn the fan blade to see if it is stuck. If so, replace the motor,
otherwise replace the PCB.
Wired
controller
communication
error
1. Check whether the connection of wired controller is correct, and
whether the wired controller matches the indoor PCB;
2. Check whether the cable of the wired controller is disconnected and
whether the connectors are firmly connected;
3. Try to replace the wired controller. If the replacement of the wired
controller cannot solve the problem, replace the indoor PCB.
1. Check whether the water level is normal and whether the water level
switch is normal;
2. If there is no water pump, check whether the SW port in PCB is short-
connected.
Running modes of indoor units are different.
1. Check whether the REMO port on the internal board is short-circuited,
if not, short-circuit it;
2. If the fault still exists after short-circuiting, replace the PCB.
Refrigerant
leakage
protection
1. Check whether the amount of external refrigerant is sufficient;
2. Check whether the sensor is installed in the correct position;
4. Outdoor unit errors troubleshooting
Communication
error between
1. communication wires connect wrongly
2. fire and zero line of IDU and ODU should be one-to-one
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