Panasonic Cs A18ekh Cs A24ekh Cu A18ekh Cu A24ekh Repair Manual

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11.10. Powerful Operation
• The Powerful operation is to achieve the setting temperature quickly.
Cooling and Soft Dry Operation condition)
• When Powerful operation is set, the setting temperature will be automatically decreased 3°C internally against the present
setting temperature (Lower temperature limit: 16°C).
• This operation automatically will be running under SHi Fan Speed (Cooling).
• Vertical Airflow Direction:-
- In “Manual” setting, the vane will automatically shift down 10° lower than previous setting.
- In “Auto” setting, the vane will automatically swing up and down. However the lower limit will be shifted 10° downward.
(Heating Operation condition)
• When Powerful operation is set, the setting temperature will be automatically increased 3°C against the present setting
temperature (Higher temperature: 30°C).
• 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 is pressed again.
- Quiet button is pressed
- Stopped by OFF/ON operation button.
- Timer OFF activates.
- Operating mode is changed. 
						

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11.11. Quiet Operation
• The Quiet operation is to provide quiet cooling/heating operation condition compare to normal operation.
(Cooling and Soft Dry Operation condition)
• Once the Quiet Mode is set at the remote control, Quiet Mode LED illuminates. The sound level will reduce either around 2 dB(A)
for Lo fan speed or 3 dB(A) for Hi/Me fan speed against the present sound level operation.
• Dew formation become severe at Quiet Lo cool, therefore Quiet Lo cool is operated only 1hr 30 min (1hr QLo, 30 min QLo + 100
rpm). After that, it goes back to QLo +180 rpm (However Quiet LED remains on).
• Manual Fan Speed:-
- RPM control during Lo cool
- RPM control during Hi & Me cool
- Auto Fan Speed:- 
						

							43 (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/Powerful button is pressed again.
- Stopped by OFF/ON operation button.
- Timer OFF activates.
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 Heating operation, the operation will start 30 minutes before the set time.
• For Automatic operation, the indoor fan will operate at SLo speed for 25 seconds, 30 minutes before the set time to detect the
intake air temperature to determine the operation mode. The operation indication lamp will blink at this time.
11.12.2. OFF Timer
• When the OFF Timer is set by using the remote control, the unit will stop operate according to the desired setting.
Notes
1. By pressing ON/OFF operation button, the ON Timer or OFF Timer setting will not be cancelled.
2. To cancel the previous timer setting, press CANCEL button.
3. To activate the previous timer setting, press SET button.
4. If main power supply is switched off, the Timer setting will be cancelled. 
						

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11.13. Random Auto Restart Control
• If there is a power failure during operation, the air conditioner will automatically restart after 3 to 4 minutes when the power is
resumed.
• It will start with previous operation mode and airflow direction.
• If there are more than one air conditioner unit in operation and power failure occur, restart time for each unit to operate will be
decided randomly using 4 parameters:- intake air temperature, setting temperature, fan speed and air swing louver position.
• This Random Auto Restart Control is not available when Timer is set.
• This control can be omitted by open the circuit of JX02. (Refer printed circuit board indoor unit)
11.14. Remote Control Signal Receiving Sound
• Long beep sound will be heard when:
- Stopping the air conditioner using ON/OFF switch.
• Short beep sound will be heard for others setting.
11.15. Auto Refresh Deo
• Deodorizing Blue LED (Auto refresh Deo) is ON for 30 min only once air conditioner is ON; after 30 min it will be off.
• In case the air conditioner is ON continuously for more that 24h, then the Deodorizing Blue LED will be reactive again after 24h x
n (n = 1,2,3,4 etc.) for 30 min each. 
						

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12 Servicing 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 “Auto OFF/ON Button” continuously for 5s (beep sound is heard) and release.
- Within 20s, press the “Auto OFF/ON Button” continuously for 5s again (2 beep sound is heard) and release.
- Various setting mode has limit up to 20s. Then return to normal operation.
12.1.1. Toggle Remote Control Signal Receiving Sound
• Under various setting mode, press the “Auto OFF/ON Button” to toggle the remote control sound.
- Short “beep”: Turn ON remote control signal receiving sound.
- Long “beep”: Turn OFF remote control signal receiving sound.
• After “Auto OFF/ON Button” is pressed, the 20s counter for various setting mode is restarted.
12.1.2. Select Remote Control Transmission Code
• There are 4 type of remote control transmission code could be selected and stored in EEPROM of indoor unit. The indoor unit
will only operate when received signal with same transmission code from remote control. This could prevent signal interference
when there are 2 or more indoor unit installed nearby together.
• To change remote control transmission code, short or open jumpers at the remote control printed circuit board.
• Under various setting mode, after select the transmission code combination of remote control, press any button of remote control
to transmit a signal to indoor unit. The transmission code will be stored in EEPROM.
• After signal is received, the various setting mode is cancelled and return to normal operation.
12.2. Remote Control Button
12.2.1. SET
• To change the type of remote control transmission signal (there are totally four types of transmission codes) 
- Modify the jumper (back of PCB) & connector (front of PCB) at remote control PCB.
- Press with pointer for more than 10 seconds.
- Face the transmitter towards indoor unit receiver and press the timer SET button (to send the signal) or if the timer SET
button is not pressed for 30 seconds, the setting mode is cancelled.
- Press timer CANCEL button to exit the setting mode.
Remote Control Printed Circuit Board Transmission Code Combination
J-A J-B Remote Control No.
* Short Open A (default)
Open Open B
Short Short C
Open Short D 
						

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12.2.2. CLOCK
• To change the remote controls 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, LED intensity for Remote Control dimmer code is transmitted.
• Above condition will not happen when Timer is set.
12.2.5. TIMER “▼”
• Press continuously for 10 seconds, set the operation and display changes as Celsius or Fahrenheit.
• Above condition will not happen when Timer is set.
12.3. Test Mode Timer Table
Test Mode
(When test point
Short-circuited) Name Time Remarks
Real Timer 1 hr. 1 min.
10 min 10 sec.
1 min. 1 sec.
Timer Delay Safety Control 2 min. 58 sec. 0 sec.
Forced Operation 60 sec. 0 sec.
Timer Save Control 7 min. 42 sec.
Anti-Freezing 4 min. 0 sec.
Auto Mode Judgement 25 sec. 0 sec.
Soft Dry OFF 6 min. 36 sec.
ON 10 min. 60 sec. Soft Dry: 10 min. operation
Cooling 40 sec. 4 sec.
70 sec. 7 sec.
Deodorizing Control 20 sec. 2 sec.
180 sec. 18 sec.
Soft Dry 40 sec. 4 sec.
360 sec. 36 sec.
Comp. Reverse Rotation Detection 5 min. 30 sec. Com. ON 5 min. and above
2 min. 0 sec.
Comp./ Fan Motor Delay Timer 1.6 sec. 0 sec.
Powerful Mode Operation 15 min. 15 sec.
Random Auto Restart Control 0 ~ 62 sec. 0 ~ 6.2 sec.
Quiet operation timer 1 hr. 30 min. 9 sec.
4 Way Valve 5 min. 30 sec.
After Deice Ended 30 sec. 3 sec. Comp. OFF after deice
Hotstart Delay Times 4 min. 0 sec.
Hotstart Finish Times 2 min. 0 sec. 
						

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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
refrigeration cycle depends on various conditions, the standard
values for them are shown in the table on the right. 
						

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13.1.1. Relationship between the condition of the air conditioner and pressure and electric
current
• Carry out the measurements of pressure, electric current, and temperature fifteen minutes after an operation is started.
13.1.2. Diagnosis methods of a malfunction of a compressor and 4-Way Valve
Cooling Mode Heating Mode
 
Low Pressure High PressureElectric current 
during operatingLow Pressure High PressureElectric current 
during operating Condition of the air 
conditioner
Insufficient refrigerant
(gas leakage)
Clogged capillary tube
or Strainer
Short circuit in the
indoor unit
Heat radiation deficiency
of the outdoor unit
Inefficient compression
Nature of fault Symptom
Insufficient compressing of a compressor• Electric current during operation becomes approximately 20% lower than the normal value.
• The discharge tube of the compressor becomes abnormally hot (normally 70 to 90°C).
• The difference between high pressure and low pressure becomes almost zero.
Locker compressor• Electric current reaches a high level abnormally, and the value exceeds the limit of an
ammeter. In some cases, a breaker turns off.
• The compressor has a humming sound.
Insufficient switches of the 4-way valve• Electric current during operation becomes approximately 80% lower than the normal value.
• The temperature different between from the discharge tube to the 4-way valve and from
suction tube to the 4-way valve becomes almost zero. 
						

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14 Disassembly and Assembly Instructions
14.1. Indoor Electronic Controllers, Cross Flow Fan and Indoor Fan Motor
Removal Procedures
14.1.1. To remove the Front Grille
• Remove the 3 caps and 3 screws at the bottom of the Front
Grille. (Fig. 1)
• Remove the Front Grille by releasing the 3 hooks at the top
of the Front Grille. (Fig. 1)
• Unhook the tabs at the Control Board to remove the Control
Board Cover. (Fig. 2)
Fig. 1
Fig. 2
14.1.2. To remove the Main Electronic Controller
• Release the 2 Particular Piece. (Fig. 3)
• Release the Indicator. (Fig. 3)
• Release the 2 screws for the earth wire. (Fig. 3)
• Release the screw Holder Terminal Board. (Fig. 3)
• Release the hooks that hold the Main Electronic Controller
and pull out the Main Electronic Controller. (Fig. 4)
Fig. 3
Fig. 4 
						

							50 • Release the CN-DATA1 connector. (Fig. 5)
• Release the CN-SONIC connector. (Fig. 5)
• Release the CN-STM2 connector. (Fig. 5)
• Release the CN-STM1 connector. (Fig. 5)
• Release the CN-TH connector. (Fig. 5)
Fig. 5
14.1.3. To remove the Power Electronic Controller
• Release the hook that hold the Particular Piece and pull out
the Power Electronic Controller. (Fig. 6)
• Release the AC-303 connector. (Fig. 7)
• Release the CN-FM connector. (Fig. 7)
• Release the 2 connector P Terminal (BROWN) and L
Terminal (BLACK) at the RY-PWR.
14.1.4. To remove the Discharge Grille
• Pull out the Drain Hose (behind the Discharge Grille) from
outlet to remove the Discharge Grille. (Fig. 8)
Fig. 6
Fig. 7
Fig. 8