Wired remote
control unit display
Outdoor unit printed circuit board LED Location or problem Check location
Abnormal
dispaly
Detail
dispaly
302 303 304 305 306 307 308 309
F40 -01 Outlet temperature sensor
problem
Outlet temperature sensor lead wire,
connector CN-TH1
-11 Compressor suction
temperature sensor problem
Suction temperature sensor (SUC T. TEMP)
lead wire, connector CN-TH2 or valve
operation (closed)
-21 Heat exchanger outlet
temperature sensor problem
Heat exchanger outlet temperature sensor
(COND TEMP) lead wire, connector CN-TH1
-31 Pipe temperature sensor
problem
Pipe temperature sensor (PIPE TEMP) lead
wire, connector CN-TH2
-51 Compressor discharge
temperature sensor problem
Compressor discharge temperature sensor
(DIS T. TEMP) lead wire, connector CN-DIS
F41 -02 High pressure switch open
circuit problem
High-pressure switch lead wire, connector
CN-PSW1
-11 Low pressure sensor problem Low-pressure sensor lead wire, connector
F42 -11 Current detector open circuit Outdoor unit P.C. B (NOISE FILTER) fault
or connector ACN2
F44 -01 Inverter protection (IPM temp.
sensor problem)
IPM fault or PCB (MAIN) fault
LED308 LED309 Unit No. (when twin or triple)
•
• •
•
The LED301 (green) illuminates to indicate that the microprocessor
on the printed circuit board is operating normally.
If the LED is switched off is flashing irregularly. Check the power
supply, and turn it off and then back on again
Master unit problem
Slave No. 1 unit problem
Slave No. 2 unit problem
86
CS-F24DB4E5 CU-L24DBE5 / CS-F28DB4E5 CU-L28DBE5
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