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6.2 Alarm codes on electronic controller
If any alarm occurs, search its cause and repair it referring to the following table.
Be sure to check the connectors in the electronic controller as the poor contact of them may cause the
controller alarm codes.
Alarm code Content Possible cause/checkpoint
F101
The high-pressure switch (HPS) contact is open HPS circuit check
・Broken lead wire
・Faulty contact
・Blown fuse Fu1
The HPS activates within 20 seconds after the
compressor starts
Condenser fan motor operation check
The fuse Fu1 is blown Fuse Fu1 circuit check
Faulty controller Faulty controller
F109
The LPT is decreased to -85 KPA or less within
2 seconds after the compressor starts
Refrigerant circuit check
・Suction stop valve
・SMV (Suction modularing valve)
・EV (Electronic expansion valve)
・LSV (Liquid solenoid valve)
・Dryer
・Clogged EV, LSV inlet filter
F301
Temperature setting request Set temperature has not been set up yet
(Set up the temperature when the controller is replaced)
F401
F403
Supply air temperature sensor SS fault
Return air temperature sensor RS fault
Faulty SS and RS
・
Broken or short-circuited lead wire
・
Faulty wiring (incomplete connection of connector)
・
Faulty sensor
F603
Faulty operation of suction modulating valve Faulty SMV body
・
Broken coil
F701
Abnormal power supply voltage Abnormal power supply voltage
・
530 V or more
F705
S phase is open phase Abnormal power supply voltage
・
S phase is open phase
・
Faulty contact of power supply facility
F803
Any of following alarm codes are displayed twice
or more: E101, 103, 105, 107, 109, 203, 205
Find the cause of the alarm for each of the issued alarm codes
E101
High-pressure switch (HPS) activates during
operation
Refer to the "The inside temperature does not decrease" and "The
high pressure is excessively high" in "6.Troubleshooting"
Low pressure transducer LPT circuit check
・Fu3, LPT fault, broken lead wire disconnection, short circuit
Shortage of refrigerant
Disconnection of high pressure transducer
Faulty controller (SRAM fault)
Faulty sensor (faulty CPU PCB)
Faulty driving circuit
・
Disconnection of connector
・
blown Fu7, 4
・
Faulty PCB for suction modulating valve (EC6)
Faulty voltage detection
・Faulty PT of PC/CT board (other than disconnection and short-circuit)
・
Faulty contact of connector
・
S phase is open phase
Faulty power supply equipment
・
Faulty contact of power plug
・
Faulty contact of power cable
・
Faulty PT/CT board (EC5)
DecosⅢ "c" or "d" for LXE10E
DecosⅢ "b" for LXE10D
Wrong controller model setting
Discharge piping refrigerant circuit check
・Discharge stop valve
・Discharge filter
・Discharge check valve
・Discharge pressure regulating valve
Faulty controller
Disconnection of high pressure switch
F111
The high pressure switch does not activate at
set value
06LXE10E-A(1-27)07.2.233:11PMページ6-13
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