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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
If HPS is activated before the compressor starts to
operate when the power is turned on. Or, if the
compressor fails to start to operate 5 times during the
starting control.
Condenser fan motor operation check
The fuse Fu1 is blown Fuse Fu1 circuit check
Faulty controller Faulty controller
F109
LPT becomes lower than -90KPA within 2 seconds after
the compressor starts to operate.
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 (disconnection of connector)
・Faulty sensor
F603
If the suction modulating valve (SMV) does not fully close
even when instructed so.
Faulty SMV body
・
Broken coil
F701
Power supply voltage error
If 270V<PT1<300V or PT1<530V within 2 seconds after
the power is turned on.
Subsequently, if PT1<300V or PT1>530V continuously for
15 seconds.
If the phase sequence (positive and negative) is unknown.
Abnormal power supply voltage
・
530V or higher, 300V or lower
F705
S phase is open phase Abnormal power supply voltage
・
S phase is open phase
・
Faulty contact of power supply facility
F803
If any of the following conditions is applicable
1) E107 is generated twice due to EV opening error. 2)
Considered that both of the 2 evaporator fans are stopped
3) Improper welding of the magnetic switch of the
compressor 4) Failures are present in any 2 of the HPT
sensor, LPT sensor and DCHS sensor
Find the cause of the alarm for each of the issued alarm
codes
E101
High-pressure switch (HPS) activates during operation Troubleshooting
→ The inside temperature does not drop.
→
Refer to the item "The high pressure is excessively high."
Low pressure transducer LPT circuit check
・Fu3, LPT fault, broken lead wire, short circuit
Shortage of refrigerant
Faulty controller (CPU board 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
Controller fault
・
CPU board fault (EC1)
・
I/O board fault (EC2)
F111
A communication error in the CPU and I/O board
06LXE10E100以降(1-26)E.qx08.8.1310:35AMページ6-13
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