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Self-diagnosis function
3. Self-diagnosis function
Error Indicator
• This function indicates type of failure in self-diagnosis and occurrence of failure for air condition.
• Error mark is displayed on display window of indoor units and wired remote controller, and 7-segment LED of outside unit
control board as shown in the table.
• If more than two troubles occur simultaneously, low number of error code is first displayed.
• After error occurrence, if error is released, error LED is also released simultaneously.
Error display method
1st and 2nd LED of 7-segment refers to the error number and the 3rd LED refers to the outside unit number.
Ex) 011: Error No. 1 of outside unit No. 1
011
➠
051: Error No. 105 of outside unit No. 1
Display Error item Root cause of error
Indoor unit
0 1 - Indoor unit air temperature sensor error
Indoor unit air temperature sensor disconnection or short
circuit
0 2 -
Inlet pipe temperature sensor of indoor
unit Indoor unit pipe inlet temperature sensor disconnection or
short circuit
0 3 -
Communication error between wired
remote controller and indoor unit Occurs when indoor unit communication signal is not
received from the wired remote controller
0 4 - Indoor unit drain error Drain pump and float switch error
0 5 -
Communication error between outside unit
and indoor unit When the indoor unit does not receive the outside commu-
nication signal continuously for 5 minutes or more
0 6 -
Indoor unit pipe outlet temperature sensor
error Indoor unit pipe outlet temperature sensor disconnection
or short circuit
0 9 - Indoor unit EEPROM error
Communication error between MICOM and EEPROM or
when there is
no indoor unit EEPROM data
1 0 -
Indoor unit BLDC motor feedback signal
error
When motor connector is removed or defective
1 7 - Inlet Air temperature sensor of FAU Air temperature sensor of indoor unit is open or short
Outside unit
2 1 1 Outside unit inverter compressor IPM fault Outside unit inverter compressor drive IPM error
2 2 1
Inverter Board Input Over Current (RMS)
of Outside Unit
Outside Unit Inverter Board Input Current excess (RMS)
2 3 1
Outside unit inverter compressor DC link
under-voltage DC voltage is not charged after outside unit operating
relay is turned on
2 4 1 Outside unit high pressure switch
Compressor maintenance by outside unit high pressure
switch Flow rate insufficiency or flow switch trouble of out-
side unit