37 
 
F indoor unit room temperature (T
1
F) 
F indoor unit evaporator temperature (T
2
F) 
EXV open angle for F indoor unit 
 
 
 
 
7.3.2 Outdoor Unit Digital Display 
A digital display is featured on the outdoor PCB. 
The LED displays different codes in the following situations: 
 Standby: “- -.” 
 Compressor operation: the running frequency. 
 Defrosting mode: “dF” or alternative displays between running frequency and   
“dF” (ach appears for 0.5s.) 
 Compressor pre-heating: “PH” or alternative displays between running frequency  
and “PH” (each appears for 0.5s.) 
 Oil return process: “RO” or alternative displays between running  
frequency and “RO” (each appears for 0.5s.) 
 Low ambient cooling mode: “LC” or alternative displays between running  
frequency and “LC” (each appears for 0.5s.) 
 Forced cooling mode: the LED displays “FC” or alternative displays between running frequency  and  
“FC” (each appears for 0.5s). 
 PFC module protection occurs three times within 15 minutes: “E6” or  
alternates between displays of running frequency and “E6” (each appears for 0.5s.) 
 In protection or malfunction, the LED displays an error code or protection code.