Panasonic Cs A7gkd Cs A9gkd Cs A12gkd Series Repair Manual

							51 c. Indoor Fan Control
• During any operation mode combines with Patrol operation, fan speed follows respective operation mode.
• During Patrol individual operation if e-ion starts, only Auto Fan Speed and no Powerful operation is allowed. Even if “Fan
Speed” button is pressed, no signal is sent to air conditioner, and no change on LCD display.
• During Patrol individual operation if e-ion stops, Indoor Fan stop operation.
d. Airflow direction (Horizontal, Vertical) Control
• During any operation mode combines with Patrol operation, air flow direction follows respective operation mode.
• During Patrol individual operation if e-ion starts, only Auto Air Swing is allowed. Even if “Air Swing” button is pressed, no
signal is sent to air conditioner, and no change on LCD display.
• During Patrol individual operation if e-ion stops, Airflow direction louver closed.
e. Indicator
• When Patrol operation starts, Patrol Sensor indicator ON.
• When e-ion operation starts based on dirtiness level, e-ion indicator ON.
f. Remote Control Receiving Sound
g. Timer Control
• When ON timer activates when unit stops, previous operation resumes without Patrol operation.
• When ON timer activates during any operation, no change and carry on current operation.
• When OFF timer activates during any operation, all operation stops.
h. Power failure
• During Patrol individual operation, if power failure occurs, after power resumes, Patrol individual operation resumes
immediately.
• During combination operation, if power failure occurs, after power resumes combination operation resume immediately.
•Normal Operation→Patrol Mode: Beep
•
Patrol Mode→St o p   : Long Beep
•
Patrol Mode→Normal Operation: Beep
•
Stop   →Patrol: Beep 
						

							52
12.16. e-ion Operation
1. Purpose
This operation provides clean air by producing negative ions to attract dust captured at the positively charged e-ion filters.
2. Control Condition
a. e-ion operation start condition
• During unit running at any operation mode, if “e-ion” button is pressed, combination operation (operation mode + e-ion
operation) starts.
• During unit is OFF, if “e-ion” button is pressed, e-ion individual operation starts.
b. e-ion operation stop condition
• When “OFF/ON” button is pressed to stop the operation.
• When “e-ion” button is pressed again.
• When “Patrol” button is pressed.
• When OFF Timer activates.
c. e-ion operation pause condition
• When indoor fan stop (during deice, odor cut control, thermostat off, etc.). e-ion operation resume after indoor fan
restarts.
• When indoor intake temperature   40°C. e-ion operation resume after indoor intake temperature < 40°C continuously for
30 minutes. 
						

							53 3. Control Content
a. Indoor fan control
• During any operation mode combines with e-ion operation, fan speed follows respective operation mode.
• During e-ion individual operation - only Auto Fan Speed and no Powerful operation is allowed. Even if Fan Speed button
is pressed, no signal is sent to air conditioner, and no change on LCD display.
Auto Fan Speed for e-ion operation switches between HLo and CLo at pattern below:
b. Airflow direction control
• During any operation mode combines with e-ion operation, air flow direction follows respective operation mode.
• During e-ion individual operation, only Auto Air Swing is allowed. Even if Air Swing button is pressed, no signal is sent to
air conditioner, and no change on LCD display.
c. Timer control
• When ON timer activates when unit stops, previous operation resumes without e-ion operation.
• When ON timer activates during any operation, no change and carry on current operation.
• When OFF timer activates during any operation, all operation stops.
d. Indicator
• When e-ion operation starts, e-ion indicator ON.
e. e-ion Check Mode
• To check if e-ion is malfunctioning, during e-ion operation press “e-ion” button for 15 seconds and release to enter e-ion
Check Mode and supplies power to the e-ion AIR PURIFYING SYSTEM.
• If abnormal discharge is detected at filter (short-circuited) due to water or dust adhesion, etc., the e-ion indicator blinks
immediately.
f. Power failure
• During e-ion individual operation, if power failure occurs, after power resumes, e-ion individual operation resumes
immediately.
• During combination operation, if power failure occurs, after power resumes, combination operation resume immediately. 
						

							54 g. Error Detection Control
When e-ion indicator blink, it indicates error listed below:
a. e-ion AIR PURIFYING SYSTEM main connector to PCB is open:
Judgment Method
• During e-ion operation (include during Patrol operation), e-ion AIR PURIFYING SYSTEM main connector to PCB is
opened.
Troubleshooting Methods
• Connect the connector or stop operation (include during Patrol operation) to cancel the blinking.
b. Abnormal Discharge
Judgment Method
• During e-ion operation, when feedback voltage is-Lo (at micro controller) is detected, it is judged abnormal discharge and
stops power supplies to the e-ion AIR PURIFYING SYSTEM.
• The unit retries after 30 minutes and repeat for 24 times. (not applicable for e-ion Check Mode)
Troubleshooting Method
• Press “e-ion” button or “OFF/ON” button to stop the operation and check the e-ion AIR PURIFYING SYSTEM main
connector to PCB.
• After that, press “e-ion” button again to confirm the e-ion indicator not blinking.
• The 24 times counter will be clear after 10 minutes of normal operation or when operation stops.
Error Reset Method
• Press “OFF/ON” button to OFF the operation.
• Press AUTO OFF/ON button at indoor unit to OFF the operation.
• OFF Timer activates.
• Press “e-ion” button during e-ion individual mode.
• Power supply reset.
c. e-ion breakdown
Judgment Method
• When hi-feedback voltage (at micro controller) supplied to filter during e-ion stop, due to PCB or filters high voltage power
supply damage.
• Operations except e-ion continue. Both Timer indicator and e-ion indicator blinks.
Troubleshooting Method
• Press “e-ion” button or “OFF/ON” button to stop the operation.
• Change main circuit board or filters high voltage power supply.
• When lo-feedback voltage supplied to e-ion AIR PURIFYING SYSTEM during e-ion operation, e-ion indicator and Timer
indicator stop blinking. 
						

							55
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.
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.
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.
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.
After Auto OFF/ON Button is pressed, the 20 seconds counter for Remote Control Receiving Sound OFF/ON Mode is
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.
• 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. 
						

							56
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:
1. Low 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.
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. 
						

							57
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. 
						

							58
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
Condition of the air
conditioner
Low Pressure High Pressure Electric current 
during operationLow 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.
• Electric current during operation becomes approximately 80% lower than the normal value.
Insufficient switches of the 4-way valve
• 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. 
						

							59
15 Disassembly and Assembly Instructions
15.1. Indoor Electronic Controllers and Control Board Removal Procedures
WARNING
• Cautions! When handling electronic controller, be careful of electrostatic discharge.
• Be sure to return the wiring to its original position.
• There are many high voltage components within the heat sink cover so never touch the interior during operation. Wait at least two minutes after
power has been turned off. 
						

							60