Panasonic CS-C18GKD / CU-C18GKD / CS-C24GKD / CU-C24GKD 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 use to
operate air conditioner with limited function if remote control is misplaced or malfunction.
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.
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” sound will occur at to identify the starting of Remote
Control Receiving Sound Off/On Mode.
Auto OFF/ON button is pressed for more than 5 seconds. 2 “beep” sound 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.
- Short “beep”: Turn ON 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.
restarted.
13.2. 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.
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.
• 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 to 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 to the right.
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14.1.1.
Relationship between the condition of the air conditioner and pressure and electric
current
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
Cooling Mode
Condition of the air
conditioner
Low Pressure
High Pressure
Electric current during operation
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
• Electric current during operation becomes approximately 20% lower than the normal value.
Insufficient compressing of a compressor
• 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.
• Electric current reaches a high level abnormally, and the value exceeds the limit of an
ammeter. In some cases, a breaker turns off.
Locked compressor
• The compressor has a humming sound.
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