6 Times 4 Times Continuous 64
PFC circuit error (9/12RLS3) /
Active lter error (15RLS3,
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, or erroneous connection. Check Active Filter Module resistance values.
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.
6 Times
10
Times
Continuous 6A Display PCB communication error
Display P.C.B. Error – Communication not received from I/O PCB for more than 10 seconds.
-Check molex plug connection for loose or erroneous connection.
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 up 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
characteristics table”). -Check voltage of Main PCB.
7 Times 2 Times Continuous 72 Compressor thermistor error
Compressor Thermistor Error – Compressor temperature thermistor is open or short-circuited while power is on
or running the compressor.
-Check for erroneous connection or removed connector.
-Check resistance on thermistor. -Check voltage to thermistor.
7 Times 3 Times Continuous 73 Heat Ex. (Pipe) thermistor error
Heat Exchanger (Pipe) Thermistor Error – When heat exchanger temperature thermistor open or short-circuit is
detected at power on or while running the compressor.
-Check connection of connector, loose, or 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 or short. Check thermistor resistance value (Refer to “Thermistor characteristics
table”).
7 Times 5 Times Continuous 75 Suction gas thermistor error
Suction Gas Thermistor Error – Suction gas temperature thermistor has shorted or open detected.
-Check the connection of the molex plug, loose or erroneous connection.
-Check ohm resistance readings of thermistor. -Check voltage of Main PCB.
7 Times 6 Times Continuous 76 2-Way valve thermistor error
2-Way Valve Thermistor Error – When 2-way valve temperature thermistor is open or short-circuited while
power is on or while running the compressor.
-Check for erroneous connection or removed connector.
-Check resistance of thermistor. -Check voltage to thermistor.
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