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....

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...

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...

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)
4...

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:...

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...

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...

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...

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...

5-2
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...