Panasonic Cs A9ekh Cu A9ekh Cs A12ekh Cu A12ekh Repair Manual

41 (Heating Operation condition)
• When the piping air temperature reaches 38°C, the louver is
changed from upper to lower limit. When the piping air tem-
perature falls to 35°C, the louver is changed from lower to
upper limit. Heating Operation
11.8.2. Manual Control
• When the vertical airflow direction is set to Manual using the remote control, the automatic airflow is released and the airflow
direction louver move up and down in the range shown in the diagram.
• The louver can be adjusted by pressing...

42 • The Fan Speed will shift as shown below:
• Vertical Airflow Direction:-
- In “Manual” setting, the vane will automatically shift down 5° lower than previous setting.
- In “Auto” setting, the vane will automatically shift between upper and lower limit depending on the intake air temperature as
Heating Mode, Airflow Direction Auto-Control. However the upper and lower limit will be shifted 5° downward.
• Powerful operation stops when:-
- Powerful operation has operate for 15 minutes.
- Powerful button...

43
11.11. Quiet Operation
(For Cooling Operation or cooling region of Soft Dry Operation)
•To provide quiet/cooling operation condition compare to normal operation.
• Once the Quiet Mode is set at the remote control, the Quiet Mode LED illuminated. The sound level will reduce around 2 dB(A)
for Lo fan speed or 3 dB(A) for Hi/Me fan speed against the present operation sound level.
• Dew formation become severe at Quiet Lo cool, therefore Quiet Lo cool is operated only 1hr 30 min (1hr QLo, 30 min QLo + 50...

44 (Heating Operation condition)
• When the Quiet Mode is set at the remote control, Quiet Mode LED illuminates. The sound level will reduce either around 2
dB (Lo) or 3 dB (Hi, Me), against the present sound level operation.
• Quiet setting of fan speed rpm refer to Indoor Fan Speed Control.
• Manual Fan Speed:-
- Rpm control during Lo, Me & Hi Cool
• Auto Fan Speed:-
- Rpm control depends on the piping air temperature sensor of Indoor heat exchanger 
• Quiet operation stops when:-
- Quiet button is...

45
11.12. Timer Control
11.12.1. ON Timer
• When the ON Timer is set by using the remote control, the unit will start to operate slightly before the set time, so that the room
will reach nearly to the set temperature by the set time.
• For Cooling and Soft Dry operation, the operation will start 15 minutes before the set time.
• For Automatic operation, the indoor fan will operate at SLo speed for 20 seconds, 30 minutes before the set time to detect the
intake air temperature to determine the operation...

46
12 Service Mode
12.1. Auto OFF/ON Button
•The “Auto OFF/ON Button” (behind the front grille) is used to operate the air conditioner if remote control is misplaced or mal-
functioning.
•Forced cooling operation is possible by pressing the “Auto OFF/ON Button” for more than 5s where “beep” sound is heard then
release the button.
•User able to select remote control transmission code and toggle remote control signal receiving sound under various setting
mode.
•To enter various setting mode:
-Press the...

47
12.2.2. CLOCK
• To change the remote control’s clock-hour and minute.
- Press once to enter the clock setting mode.
- Use timer increment button timer decrement button to change the time.
- Press once again to exit the setting mode.
• To change the time format (24 hours & 12 hours timer display).
- Press for more than 5 seconds.
12.2.3. RESET
• To clear and restore the remote control setting to factory default.
- Press for once to clear the memory.
12.2.4. TIMER “ ”
• Press continuously for 5 seconds,...

48
13 Troubleshooting Guide
13.1. Refrigeration Cycle System
In order to diagnose malfunctions, make sure that there are no
electrical problems before inspecting the refrigeration cycle.
Such problems include insufficient insulation, problem with the
power source, malfunction of a compressor and a fan.
The normal outlet air temperature and pressure of the refrigera-
tion cycle depends on various conditions, the standard values
for them are shown in the table to the right. 

49
13.2. Relationship Between The Condition of The Air Conditioner and Pres-
sure and Electric Current
• Carry out the measurements of pressure, electric current, and temperature fifteen minutes after an operation is started. 
13.3. Diagnosis Methods Of A Malfunction Of A Compressor And 4-way Valve
Cooling Mode Heating Mode
Condition of the air
conditioner
Low Pressure High Pressure Electric current 
during operationLow Pressure High Pressure Electric current 
during operation
Insufficient refrigerant...

50
14 Disassembly and Assembly Instructions
14.1. Indoor Electronic Controllers Removal Procedures
• Remove the 2 caps and 2 screws at the bottom of the Front
Grille. (Fig. 1)
Fig. 1• Remove the Front Grille Complete. (Fig. 2)
Fig. 2• Release the taps on the top and on the right side of Control
Board Front Cover. (Fig. 3)
• Then remove the Control Board Front Cover. (Fig. 3)
• Remove the Indicator Complete. (Fig. 3)
Fig. 3