Panasonic Inverter Air Conditioner R410A Technical Data And Service Manual

							4-7
4. Service procedures
Judgment condition
Clear condition
F31
L02
L04
L07
L10
L13
 E07  E06
E14
E15
E16
E20
E31
H01
Remote
controller
alarm displayAlarm
contentsJudgment and correction
Automatic recovery EEPROM trouble Reading/writing failure Recovery at power 
reset1. Check EEPROM (IC007).
2. Check outdoor unit control 
PCB.
Mismatch of indoor 
and outdoor unit types 
(Espacio, Multi )Indoor unit judges that type 
does not match outdoor unit 
type.Recovery at power 
reset1. Check indoor unit EEPROM.
2. Check indoor unit control 
PCB.
Settings failure
Settings failure
Settings failureDuplicated outdoor unit 
address (system address)1. Check outdoor unit 
system address.
2. Check inter-unit control 
wiring.
Group control wiring is 
connected to an 
independent-control indoor Recovery at power 
reset1. Check inter-unit control 
wiring.
2. Check indoor unit 
EEPROM.
Outdoor unit capacity not set. Recovery at power 
resetCheck outdoor unit EEPROM.
Indoor-outdoor unit 
typesOutdoor unit judges that type 
does not match indoor unit 
type.Recovery at power 
reset1. Check indoor unit 
EEPROM.
2. Check outdoor unit control 
PCB.
Outdoor unit detected 
abnormal signal from 
indoor unit.Serial signal receiving failure 
(including failure to verify No. 
of units)
Automatic
recovery Automatic
recovery1. Check inter-unit control 
wiring.
2. Check outdoor unit 
Outdoor unit sending 
failure to indoor unitl o r t n o c t i n u - r e t n i k c e h C . 1 e r u l i a f g n i d n e s l a n g i s l a i r e S
wiring.
2. Check outdoor unit control 
PCB.
Settings failure Duplicated master unit in 
simultaneous-operation multi 
control
(Detected by outdoor unit)Recovery at power 
reset1. Check inter-unit control 
wiring.
2. Check indoor unit 
combination.
Automatic address 
setting failure
Automatic address 
setting failure
Automatic address 
setting failureIndoor unit capacity too low. Recovery at power 
reset
Recovery at power 
reset
Recovery at power 
reset1. Check inter-unit control 
wiring.
2. Check outdoor unit control 
PCB.
l o r t n o c t i n u - r e t n i k c e h C . 1 . h g i h o o t y t i c a p a c t i n u r o o d n I
wiring.
2. Check outdoor unit control 
PCB.
Outdoor unit cannot receive 
any serial signals from indoor 
units.1. Check inter-unit control 
wiring.
2. Check outdoor unit control 
PCB.
Communications
trouble within unitNo communication possible 
with MDC for 3 minutes or 
longer.Automatic recover y Check outdoor unit control 
PCB.
Overcurrent  Inverter stops after alarm is 
detected.Recovery at restart 1. Refrigerant cycle trouble, 
overload operation
2. Loose screws between HIC 
control PCB and radiating 
plate
3. Cooling failure of radiating 
plate
4. Check outdoor unit PCB 
wiring.
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							4-8
4. Service procedures
No
No
No
No
NoNo
No No
No
Ye s Ye s Ye sYe s
Ye s
Ye s Ye s Ye s Ye s
[Alarm “P29”]
(MDC trouble) (1)
Input power detection circuit trouble
Compressor does not run.
Breakdown
Motor current detection circuit trouble
Is power OK? Correct power line.
Is
current
detection
circuit wiring
OK?Check and correct 
wiring.
Are
wiring and 
connector
connections
OK?Check and correct
wiring.
 Is 
compressor
 OK?
 Ground 
fault?Replace
compressor.
 Coil 
resistor
short circuit?
Coil open 
circuit?
Is there 
abnormal refrigerant 
accumulation?Replace
compressor.
Is
operation of 
electronic
control valve 
OK?
Replace outdoor 
unit control PCB. Are 
C1 and TS 
sensors
OK?  Replace C1 and 
TS sensors.
Replace electronic 
control valve.
Is there overload? Remove 
the cause.
4-3. Details of Alarm Messages
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							4-9
4. Service procedures
No
No
No
NoNo
No
No Ye s
Ye s
Ye s
Ye s
Ye s
Ye s
Ye s
Replace outdoor unit 
control PCB.
(2)  [Alarm “P26”]
   HIC PCB trouble)IGBT short-circuit protection on inverter control (IPDU) PCB 
Is power OK?
 Correct power line.
Are
circuit wiring, 
connector
connections, and 
reactor
connections
OK?
Correct.
Has filter PCB 
RY001 or RY002 
relay activated?
 Has filter PCB 
AC fuse blown?  Replace filter PCB.
Disconnect
U.V.W. output 
terminal on HIC PCB and 
start operation. 
Does alarm 
“P26”
occur?
 Replace HIC PCB.
Is
compressor OK? 
(Check for layer 
short circuit.) Replace compressor.
Is
resistance
between
each terminal on 
HIC PCB OK? 
(See following 
page.)
 Check HIC PCB.
 Replace if PCB 
has failed.
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							4-10
4. Service procedures
HIC +Between terminals Resistance
HIC +
HIC +
HIC +
HIC –
HIC –
HIC –HIC –
U
V
W
U
V
W
Resistance
200 kΩ or more
300 kΩ or more
300 kΩ or more
300 kΩ or more
200 kΩ or more
200 kΩ or more
200 kΩ or more
No
Ye s
Replace outdoor unit 
control PCB.
(3) [Alarm “E31”]
 (communications 
  trouble within unit)IGBT short-circuit protection
Is “E31”
displayed even after 
the power voltage 
is reset?Normal
HIC-CH4872R
(42 Type)HIC-CH2672R
(26, 36 Type)
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							4-11
4. Service procedures
 
 
 
No
No
No
No Ye s
Ye s
Ye s
Ye s
(4) [Alarm P22]Outdoor unit fan motor drive circuit trouble
Are connectors CN003 and CN004 connected 
correctly to the outdoor unit control PCB? Correct the connector 
connections.
Disconnect connectors CN003 and CN004 
from outdoor unit control PCB, and rotate 
fan by hand. Does it rotate easily?
Outdoor unit fan motor coil resistance is 
OK if it is as shown below.
(1) Red – white:  30 – 40 Ω
(2) White – black: 30 – 40 Ω
(3) Black – red: 30 – 40 Ω *  Disconnect connector CN004 and 
  measure on the plug side.
Motor position detection circuit resis-
tance is OK if it is as shown below.
*  Disconnect connector CN003 and measure 
  on the plug side.
(1) Grey – yellow:  100 kΩ or more, or ∞ (open)
(2)  Grey – blue:   100 kΩ or more, or ∞ (open)
(3)  Grey – orange: 100 kΩ or more, or ∞ (open)
Fan motor is OK; outdoor unit 
control PCB has failed.
→ Replace.Fan motor trouble
→ Replace.
Note:
In the case of a GND circuit failure inside the motor, the results 
of the above check may be OK.
If operation is not OK after the outdoor unit control PCB has 
been replaced, then replace the outdoor unit fan motor.
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							4-12
4. Service procedures
No
No Ye s
Ye s
Check the outdoor unit 
control PCB.
Replace if PCB has failed.
Sensor trouble
(5) [Alarms “F04,” “F06,” “F07,” “F08,” “F12”]
Are connectors 
CN020, 021, 022, 023, 
and 024 (TD,  TO, C1, C2, and 
TS sensors) connected 
correctly to the outdoor unit 
control PCB? Correct the connector 
connections.
Are the TD,  TO, C1, 
C2, and TS sensor resistance* 
characteristics OK? Replace the TD,  TO, C1, 
C2, or TS sensor.
* Refer to “4-4. Table of Thermistor Characteristics.”
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							4-13
4. Service procedures
Sensor installation Sensor 
Sensor typeSensor
Sensor type
s s e r d d a s s e r d d a n o i t a c o l
00 Room temp.  05 –
(temp. used for control)*
01 Remote controller temp. 06 Discharge temp.
Indoor unit 02 Indoor intake temp. 07 –
03 Indoor heat exchanger temp. (E1 ) 08 –
04 Indoor heat exchanger temp. (E2 ) 09 –
0A Discharge temp. (TD ) 12 –
– 3 1 – b 0
  t n e r r u C 4 1 – C 0
(AC current)
Outdoor unit 0d Intake temp. (TS ) 15 Outdoor electronic control
valve position
0E Outdoor heat exchanger temp. (C1 ) 16 –
0F Outdoor heat exchanger temp. (C2 ) 17 –
– 8 1 – 0 1
11 Outdoor air temp. 19 –
Sensor Temperature Correlation Table
* Main unit only when group control is enabled
Figure:  Sample display when discharge 
  temperature at unit No. 1-1 is 185F
Sensor Temperature Display Function (Displayed both when operating and stopped)
The below check procedure can be used to display
all remote controller, indoor unit, and outdoor unit
sensor temperatures.
 
(1) Press and hold the button and button simultaneously
for 4 seconds or longer.
(2) Unit No. X-X (main unit No.), item code XX (sensor
address), and service monitor 00XX (sensor tem-
perature) appear on the remote controller LCD. (See
figure.)
(3) Press the temperature setting and buttons and
change the item code to the sensor address of the
sensor that you want to monitor.
(For the relationship between the sensor address and
the sensor type, refer to the below Sensor Tempera-
ture Correlation Table.)
(4) During group control and simultaneous operation
multi control, press the button and change to the unit
that you want to monitor.
(5) Press the button to return to normal remote controller
operation.
NOTE
The temperature display reads “- - - - ” for units that are
not connected.
If monitor mode is selected during normal operation,
the only parts of the LCD that change are those
shown in the figure.
All other displays do not change, and remain as they
were during normal operation.
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							4-14
4. Service procedures
Check Pin
Short-circuit the cooling check pin (or heating check pin) on the outdoor unit control PCB to perform the control
described below.
1. Thermistor checks
The checks listed below are performed for 1 second each, in order from the top down. The results are displayed
by LED 1 and 2.
Discharge temp. (TD)     
Outdoor air temp. ( TO)    
Heat exchanger temp. (C1)     
Heat exchanger temp. (C2)     
Intake temp. (TS)    ThermistorCheck results
Normal  Abnormal
LED 1 and 2 OFF LED 1 lit
LED 1 lit
LED 1 lit LED 2 lit
2. 4-way valve turns ON for 1 second.
3. Forced cooling (or heating) operation
4-4. Table of Thermistor Characteristics
(1) Outdoor Air Temp. (TO), Intake Temp. (TS), Heat
Exchanger Temp. (C1) Sensor, Heat Exchanger
Temp. (C2) Sensor(2) Discharge Temp. (TD) Sensors
Temperature ( F)
Resistance (kΩ)
Temperature (°F)
Resistance (kΩ)
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							5-1. Overview......................................................................................................................... 5-2
5-2. Functions ....................................................................................................................... 5-2
5-3. Normal Display Operations and Functions ................................................................. 5-3
5-4. Monitoring Operations: Display of Indoor Unit and Outdoor Unit Sensor
Temperatures ............................................................................................................. 5-6
5-5. Monitoring the Outdoor Unit Alarm History: Display of Outdoor Unit
Alarm History ............................................................................................................. 5-7
5-6. Setting Modes: Setting the Outdoor Unit EEPROM ..................................................... 5-7
5. OUTDOOR UNIT MAINTENANCE REMOTE CONTROL
5-1
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							5-2
5. Outdoor unit maintenance remote control
5-1. Overview
What is the outdoor unit maintenance remote controller?
Beginning with the DC-INV series of outdoor units, nonvolatile memory (EEPROM) is
used in the outdoor unit PCB. In this way, the setting switches that were located on
earlier PCBs have been converted to EEPROM data. This remote controller is an
outdoor unit maintenance tool that is used to make and change the EEPROM set-
tings.
This remote controller can be used for checking the outdoor unit EEPROM settings
and contents, and also can be used to monitor the outdoor unit alarm history and
indoor/outdoor unit temperatures, and to check the status of the indoor unit connec-
tions (No. of units, operating status, etc.).
Note: Because this tool does not function as a remote controller, it is used only
during test runs and servicing.
System diagram
Outdoor unit maintenance 
remote controller
Remote controller 
Outdoor unit
Outdoor unit 
control PCB
Inter-unit control wiring (main bus)
Indoor
unitIndoor
unit
Remote
controllerRemote
controller
Special service checker wiring 
(Optional, Servicing No:CV6231785082) 
* The special service checker wiring is required in order to connect the outdoor unit maintenance remote control-
ler to the outdoor unit PCB.
* Even when the outdoor unit maintenance remote controller is connected, a separate remote controller or other
control device must be connected to the indoor unit.
5-2. Functions
Normal display functions
(1) Functions: Button operations can be used to perform the following functions.
 Start/stop of all indoor units
 Switching between cooling and heating
 Test run of all indoor units
 High-speed operation of indoor units (Do not use with actual units. This may damage the devices.)
(2) Display: The following can be displayed.
 Alarm details display
 No. of indoor/outdoor units
 Unit Nos. of connected indoor/outdoor units
 Indoor/outdoor unit operating status (blinks when an alarm occurs)
 Indoor unit thermostat ON
 Individual display of outdoor unit alarms
 Outdoor unit compressor total operating time
 Outdoor unit oil sensor oil level
 Outdoor unit total power ON time
 Outdoor unit microcomputer version
 Other
Temperature monitor
 Displays the indoor/outdoor unit sensor temperatures.
Outdoor unit alarm history monitor
 Displays the outdoor unit alarm history.
Setting modes
 Setting mode 1 and setting mode 2 are used to make the outdoor EEPROM setting.CZ-RTC2
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