6 Times 4 Times Continuous 64
PFC circuit error (9/12RLS3)
Active lter error (15RLS3
15RLS3H, 30RLXEH)
PFC Circuit Error (9/12RLS3) – When inverter output DC voltage is higher than 415V for over 3 seconds, the
compressor stops. If the same operation is repeated 5 times, the compressor stops permanently.
-Check external cause at the indoor and outdoor (voltage drop or noise).
-Check connection of connector, loose, erroneous connection.
-Replace Main PCB.
Active Filter Error (15RLS3, 30RLXEH) – When inverter input DC voltage is higher than 425v or lower than 80V.
When a momentary power cut off occurred on low voltage.
-Check external cause at the indoor and outdoor (voltage drop or noise).
-Check connection of connector, loose, erroneous connection.
-Check Active Filter Module resistance values.
-Replace Main PCB.
6 Times 5 Times Continuous 65 IPM error
IPM Error – Abnormal current value at the IPM is detected. Heat radiation is blocked (inlet/outlet).
-Check connections of outdoor unit electrical components.
-Check outdoor fan, heat exchanger.
-Check compressor resistance values.
7 Times 1 Time Continuous 71 Discharge thermistor error
Discharge Thermistor Error – When discharge pipe temperature thermistor open or short-circuit is detected at
power on or while running the compressor.
-Check connection of connector, loose, erroneous connection.
-Check thermistor for open or short. Check thermistor resistance value (Refer to “Thermistor characteristics
table”).
-Check voltage of Main PCB.
7 Times 2 Times Continuous 72 Compressor thermistor error
Compressor Thermistor Error – When the compressor temperature thermistor is open or short-circuit is detected
at power up or while running the compressor.
-Check connection of connector, loose, erroneous connection.
-Check thermistor for open or short. Check thermistor resistance value (Refer to “Thermistor characteristics
table”).
-Check voltage of Main PCB.
7 Times 3 Times Continuous 73
Heat Ex. (Pipe) thermistor
error
Heat Ex. middle temp.
thermistor error /
Heat ex. liquid temp.
thermistor error (30RLXEH)
Heat Exchanger (Pipe) Thermistor Error – When heat exchanger temperature thermistor open or short-circuit is
detected at power up or while running the compressor.
-Check connection of connector, loose, erroneous connection.
-Check thermistor for open or short. Check thermistor resistance value (Refer to “Thermistor characteristics
table”).
-Check voltage of Main PCB.
7 Times 4 Times Continuous 74 Outdoor thermistor error
Outdoor Thermistor Error – When outdoor temperature thermistor is open or a short-circuit is detected at power
on or while running the compressor. - Check connection of connector, loose, erroneous connection.
-Check thermistor for open for open or short. Check thermistor resistance value (Refer to “Thermistor character-
istics table”).
7 Times 7 Times Continuous 77 Heat sink thermistor error
Heat Sink Thermistor Error – Heat sink temperature thermistor (built-in IPM) is open or shorted.
-Inverter PCB failure
-Replace inverter PCB.
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