Panasonic CS-A18GKD / CU-A18GKD / CS-A24GKD / CU-A24GKD Service Manual ▷ View online
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13 Servicing Mode
13.1. Auto OFF/ON Button
1. AUTO OPERATION MODE
The Auto operation will be activated immediately once the Auto OFF/ON button is pressed. This
operation can be used to operate air conditioner with limited function if remote control is misplaced or
malfunction.
operation can be used to operate air conditioner with limited function if remote control is misplaced or
malfunction.
2. TEST RUN OPERATION (FOR PUMP DOWN/SERVICING PURPOSE)
The Test Run operation will be activated if the Auto OFF/ON button is pressed continuously for more
than 5 seconds. A “beep” sound will occur at the fifth seconds, in order to identify the starting of Test
Run operation.
than 5 seconds. A “beep” sound will occur at the fifth seconds, in order to identify the starting of Test
Run operation.
3. REMOTE CONTROL RECEIVING SOUND OFF/ON MODE
The Remote Control Receiving Sound OFF/ON operation will be activated if (within 20 seconds of Test
Run Operation) the Auto OFF/ON button is pressed for more than 5 seconds. 2 “beep” sounds will occur
at to identify the starting of Remote Control Receiving Sound Off/On Mode.
Run Operation) the Auto OFF/ON button is pressed for more than 5 seconds. 2 “beep” sounds will occur
at to identify the starting of Remote Control Receiving Sound Off/On Mode.
Press “Auto OFF/ON button” to toggle remote control receiving sound.
• Short “beep”: Turn ON remote control receiving sound.
• Long “beep”: Turn OFF remote control receiving sound.
• Long “beep”: Turn OFF remote control receiving sound.
After Auto OFF/ON Button is pressed, the 20 seconds counter for Remote Control Receiving Sound
OFF/ON Mode is restarted.
OFF/ON Mode is restarted.
13.2. Select Remote Control Transmission Code
• There are 4 types 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 units installed nearby together.
when there are 2 or more indoor units installed nearby together.
• To change remote control transmission code, short or open jumpers at the remote control printed circuit board.
• During Remote Control Receiving Sound OFF/ON Mode, press any button at remote control to transmit and store the desired
transmission code to the EEPROM.
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13.3. Remote Control Button
13.3.1. SET BUTTON
• To check current remote control transmission code
- Press for more than 10 seconds
• To change the air quality sensor sensitivity
- Press and release with pointer.
- Press the Timer Decrement button to select sensitivity:
- Press the Timer Decrement button to select sensitivity:
1. Low Sensitivity
2. Standard (Default)
3. Hi Sensitivity
2. Standard (Default)
3. Hi Sensitivity
- Confirm setting by pressing Timer Set button, a “Beep” sound will be heard. LCD returns to original display after 2 seconds.
- LCD returns to original display if remote control does not operate for 30 seconds
- LCD returns to original display if remote control does not operate for 30 seconds
13.3.2. CLOCK BUTTON
• To change the remote control’s time format.
- Press for more than 5 seconds
13.3.3. RESET (RC)
• To clear and restore the remote control setting to factory default
- Press once to clear the memory.
13.3.4. TIMER
▲
• To change indoor unit indicator’s LED intensity
- Press continuously for 5 seconds.
13.3.5. TIMER
▼
• To change remote control display from Degree Celsius to Degree Fahrenheit.
- Press continuously for 10 seconds.
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14 Troubleshooting Guide
14.1. 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.
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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14.1.1. 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.
14.1.2. Diagnosis methods of a malfunction of a compressor and 4-Way Valve
Cooling Mode
Heating Mode
Low Pressure
High Pressure
Electric current
during operating
Low Pressure
High Pressure
Electric 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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