Test Run
70
Inverter PCB error display method
Red LED means error number 10 digits, and green LED
means 1 digit, and if red and green blink at the same time,
it means the unit of 100.
Ex) Inverter compressor IPM defect Error : error number 21
Red LED1: 10 digits
Green LED2: 1 digit
Error No. Error Type Main Reasons
bc21 Inverter compressor IPM defect
Inverter compressor drive IPM defect / inverter com-
pressor defect
bc22 Inverter compressor overcurrent Increase of inverter compressor CT value
bc23 Inverter compressor DC Link low voltage
After inverter activation relay is ON, DC voltage
recharge defect
bc25 High/low Inverter input voltage
Inverter input voltage exceeds the unit limit and lasts
for 4 s (173V ~ 289V)
bc26 Inverter compressor activation failure
Inverter compressor error, causing initial activation
failure
bc27 Inverter PSC/PFC Fault Error Error by overcurrent at inverter input
bc28 Inverter DC Link high voltage error
Inverter DC voltage recharge, causing compressor
OFF
bc29 Inverter compressor overcurrent
Inverter compressor activation failure or increase of
CT value
bc32
Excessive rise of inverter compressor discharge tem-
perature
Excessive rise of inverter compressor discharge tem-
perature, causing compressor OFF
bc34 Excessive rise of high pressure of inverter compressor
Excessive rise of high pressure of inverter compres-
sor, causing compressor OFF
bc35 Excessive drop of low pressure of inverter compressor
Excessive drop of low pressure of inverter compres-
sor, causing compressor OFF
bc36 Low pressure ratio error of inverter compressor
High pressure/low pressure ratio of inverter compres-
sor is maintained at below 1.8 for 3 min. or more
bc40 Inverter compressor CT sensor defect Inverter compressor CT sensor defect
bc41
Inverter compressor discharge pipe temperature sen-
sor defect
Inverter compressor discharge temperature sensor
disconnection or short circuit
bc42 Low pressure sensor defect of inverter compressor
Low pressure sensor disconnection or short circuit of
inverter compressor
bc43 High pressure sensor defect of inverter compressor
High pressure sensor disconnection or short circuit of
inverter compressor
bc44 Inverter inside air temperature sensor defect
Inverter inside air temperature sensor disconnection or
short circuit
bc46
Inverter compressor suction pipe temperature sensor
defect
Inverter compressor suction temperature sensor dis-
connection or short circuit
bc53
Communication error(indoor unit → outdoor unit main
PCB)
Outdoor unit does not receive signal from indoor unit
bc60 Inverter PCB EEPROM error Inverter PCB EEPROM error
bc62 Excessive rise of inverter heatsink temperature
Inverter PCB heat generation, causing the rise of
heatsink temperature
bc65
Inverter heatsink temperature sensor
defect
Inverter heatsink temperature sensor disconnection or
short circuit
bc73 Overcurrent (Peak) detected at inverter input Error by overcurrent detection at inverter input
Error
Code
Description
LED 1
(Red)
LED 2
(Green)
21 Inverter compressor IPM efect
2times ◑ 1time ◑
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