Panasonic Inverter Air Conditioner R410A Technical Data And Service Manual

							3-19
3. Electrical data
3-2 Outdoor Units
U-42PE1U6
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							3-20
3. Electrical data
3-2 Outdoor Units
U-42PS1U6
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							3-21
3. Electrical data
3-2 Outdoor Units
U-42PS1U6
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							4-1. Meaning of Alarm Messages ......................................................................................... 4-2
4-2. Symptoms and Parts to Inspect ................................................................................... 4-5
4-3. Details of Alarm Messages ........................................................................................... 4-8
4-4. Table  of Thermistor  Characteristics ............................................................................ 4-14
4. SERVICE PROCEDURES
4-1
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							4-2
4. Service procedures
Remote controller is
detecting error signal from 
indoor unitE01
E02
E10
E11
E14 E03
E08
E09
E04
E05
E06
E07 E15 E12
E16
E20
E17
E18
E31
L01
L02
L03
L04
L07
L08
L09
L10
L11
L13 Indoor unit is detecting error signal from remote controller (and system controller)Error in receiving serial communication signal
(Signal from main indoor unit in case of group control)
Auto address is not completed Outdoor system address, indoor system address, or indoor unit
individual/main/sub setting is not set
(Automatic address setting is not completed)
Error in transmitting serial communication signal
Improper setting of indoor
unit or remote controllerIndoor unit address setting is duplicated
Remote controller setting is duplicated
Error in transmitting serial communications signal
Error in transmitting serial communications signalError in receiving serial communications signal
Error in receiving serial communications signal Indoor unit is detecting error 
signaled from signal option
Setting error
Main unit duplication in simultaneous-operation multi control
(detected by outdoor unit)
Indoor unit is detecting error 
signaled from outdoor unit
Outdoor unit is detecting
error signaled from indoor
unit Automatic address setting
failed
An indoor unit detected 
trouble in the signal from 
another indoor unit
Communications trouble 
between units
Setting error Mis-setting
Continued
Error in transmitting serial communications signalI Starting auto address setting is prohibited
This alarm message shows that the auto address connector 
CN100 is shorted while other RC line is executing auto address 
operation.
ndoor unit capacity too low
Indoor unit capacity too high
No indoor units connected
Error in receiving serial communications signal
Communications failure with MDC
Indoor unit group settings error
Indoor/outdoor unit type mismatch
Main unit duplication in group control (detected by indoorunit)
Outdoor unit address duplication (system address)
Group wiring connected for independent indoor unit
Address not set or group not set
Indoor unit capacity not set
Outdoor unit capacity not set or setting error
Miswiring in group control wiring
Indoor unit type setting error (capacity) Error in transmitting serial communications signal Error in receiving serial communications signal (including unit
quantity verification failure)
Simultaneously Simultaneously Simultaneously
Simultaneously
Serial commu-
nication errors
Mis-settingWired
remote
control
display
Wireless
remote controller
receiver display
ON:
Operation
Timer
Standb
y
Blinking: OFF:
Possible cause of malfunction
4-1. Meaning of Alarm Messages
(1) Contents of remote controller switch alarm display
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							4-3
4. Service procedures
P09
P01
P10
P03
P04
P05
P15
P19
P20
P22
P26
P29
P31
H01
F01
F02
F10
F04
F06
F07
F08
F12
F29Ceiling panel connection failure
Indoor protection
Fan protective thermostat
Float switch
Discharge temperature trouble
High pressure switch or compressor motor thermal protector is activated.
Open phase detected, AC power trouble
No gas
4-way valve locked
High cooling load
Outdoor fan trouble
Inverter compressor trouble (HIC PCB)
Inverter compressor trouble (MDC)
Simultaneous-operation multi control trouble
Compressor current failure (overload)
Indoor heat exchanger temperature sensor (E1)
Indoor heat exchanger temperature sensor (E2)
Indoor temperature sensor
Discharge temperature (TD)
Outdoor heat exchanger temperature (C1)
Outdoor heat exchanger temperature (C2)
Outdoor air temperature (TO)
Intake temperature (TS)
Indoor EEPROM error Outdoor protection
Thermistor open circuit
 Short circuit (indoor)
Thermistor open circuit
 Short circuit (outdoor) Activation of
protective
device
Thermistor
fault
Outdoor EEPROM error
F31
Alternately
Alter.
Alter.
Simul.
Simul.
Alternately
Wired
remote
control
displayWireless
remote controller
receiver display
Operation
Timer
Standby
Possible cause of malfunction
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							4-4
4. Service procedures
(2) LED Indicator Messages on Outdoor Control PCB
Power ON sequence
1. No communication from indoor units in system
2.  Communication received from 1 or more indoor units in system
3. Regular communication OK (Capacity and unit quantity match)If it is not possible to 
advance to 3, repeats 1 → 2.
At 3, changes to normal 
control.
P03 Normal operation
Automatic address setting in progress
Automatic address setting alarm (E15)
Automatic address setting alarm (E20)
Automatic address setting alarm (Other than E15 and E20) EEPROM error (F31)
Blinking alternately
Blinking simultaneously
Blinking simultaneously
Blinking simultaneously Alarm
LED 1 blinks M times, then LED 2 blinks N times.
The cycle then repeats.
M = 2: P alarm6: L alarm
N = Alarm No. 
* Refer to 
“1.  Examples of alarm display” below.
3: H alarm 4: E alarm 5: F alarm
Alternate blinking during alarms
Insufficient gas indicator
Refrigerant recovery mode
Automatic address setting
Displayed during automatic 
address setting 1 and initial 
communication. After these are  
completed, alarm F31 is displayed.
Pre-trip (P20) Pre-trip (insufficient gas) 
Pre-trip (other)
(0.25/0.75)
(0.75/0.25)
(0.25/0.75)
(0.75/0.25)(0.25/0.75)
(0.75/0.25)
ON :
:
:
LED 1 LED 2 Remarks
OFF Blinking (0.25/0.75) indicates that the lamp illuminates for 0.25 seconds, and then is OFF for 0.75 seconds. 
Unless otherwise indicated, the blinking is (0.5/0.5).
Note:
This table shows example alarms. Other alarms  
may also be displayed . P03
P04
P05
P31
H01

E04

F07

L13
( Blinks 2 times )
(
 )
(
 )
(
 )
(Blinks 3 times)

(Blinks 4 times)

(Blinks 5 times)

(Blinks 6 times)
(Blinks 3 times)
(Blinks 4 times)
(Blinks 5 times)
(Blinks 31 times)
(Blinks 1 times)
(Blinks 4 times)
(Blinks 7 times)
(Blinks 13 times) Alarm / Display LED 1 Alternately
→ → LED 2
(3) Examples of alarm display (other than E15, E16, and E20)
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							4-5
4. Service procedures
4-2. Symptoms and Parts to Inspect
Judgment condition
Clear condition
P03
P05 P04
P15
P19
P20
P22
P26 Remote
controller
alarm displayAlarm
contentsJudgment and 
correction
Abnormal discharge 
temperature
 Discharge temp. 
detected at or 
above the specified 
value.Stops when temp. exceeds 
232 F.Recovery at restart
Recovery at restart Recovery at restart
Recovery at restart
Recovery at restart
Recovery at restart
Recovery at restart
Recovery at restart1. Check refrigerant cycle 
(gas leak).
2. Electronic control valve 
trouble
3. Check tubing sensor (TD).
Missing phase  High pressure 
switch is activated.
Compressor motor 
thermal protector is 
activated.
detected. (CT 
disconnected or AC 
power trouble)Current value sent from MDC  Stops when pressure 
exceeds 600 psi.
Stops when temp. exceeds
230 F.
on outdoor unit control PCB is 
low.
No AC power input for 3 
minutes or longer: pre-trip - 51. Check R/S/T power.
2. Check inverter control PCB.
3. Check outdoor unit control 
PCB.
Insufficient gas level 
detected.The following conditions 
continue for 1 minute.
 Discharge temp. is 203 F or 
higher.
 Electronic control valve is at 
step 480.
 Current value from MDC is 
2.0 A or less.Check refrigerant cycle 
(gas leak).
4-way valve locked
 Judgment occurs 
after compressor 
has been ON for 5 
minutes.Indoor heat exchanger temp. 
drops although compressors 
are ON in heating mode:
  [min(E1, E2)] ≤ 50 F.
Indoor heat exchanger temp. 
rises although compressors are 
ON in cooling mode:
E2≥ 104 F.1. Check 4-way valve.
2. Check 4-way valve wiring.
3. Check outdoor unit control 
PCB.
High-pressure
protection trouble 1. Refrigerant cycle 
overload operation
2. Outdoor coil temperature 
sensor C1 or C2
Outdoor unit fan 
motor trouble
 Inverter protection 
circuit was 
activated, or lock 
was detected, at 
outdoor unit fan 
motor.Inverter stops after alarm is 
detected1. Position detection trouble
2. Overcurrent protection 
circuit at outdoor unit fan 
motor was activated.
  Check outdoor unit control 
PCB.
  Refer to outdoor unit fan 
judgment methods.
Inverter protection 
circuit was 
activated, or G-Tr 
short-circuit (short 
time: 0.8 s or less) 
in inverter control Inverter stops after alarm is 
detected. Alarm is output 
when inverter stops (pre-trip) 
consecutively 4 times.1. Stops immediately when 
restarted.
  Layer short in the 
compressor
2. Check inverter control 
PCB.
  Wiring trouble 1. Check the high pressure 
switch connector is 
securely connected.
2. Check the ourdoor unit heat 
exchanger is not clogged 
(cooling operation).
3. Check the indoor unit air 
filter has not become 
clogged (heating operation)
If MAX (C1,C2) is 142°F or 
higher, the compressor stops 
one. The compressor restarts 
three time, and if the 
temperature does not 
decrease to less than 142°F,  
the alert “P20” is displayed.
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							4-6
4. Service procedures
Judgment condition
Clear condition
P29
F04
F06Alarm
contentsJudgment and correction
Recovery at restart
Recovery at restart
Recovery at restart
Recovery at restart
Recovery at restart Current detection 
circuit trouble
 AC current value is 
high even when 
compressor is 
stopped.Inverter stops after alarm is 
detected. Alarm is output 
when inverter stops (pre-trip) 
consecutively 4 times.1. Stops immediately when 
restarted.
  Layer short in the 
compressor
2. Check inverter control PCB.
  Wiring trouble
Compressor motor 
output trouble, 
Inverter compressor 
trouble,
MDC troubleInverter stops after alarm is 
detected.1. Refrigerant cycle trouble, 
overload operation
2. Loose screws and contact 
failure between HIC control 
PCB and radiating plate
3. Cooling failure of radiating 
plate
4. Check outdoor unit PCB 
wiring.
Compressor does not 
run. (Overcurrent  
protection circuit 
activates after a certain 
period of time following 
compressor start.)Inverter stops after alarm is 
detected.1. Compressor trouble (locked, 
etc.)
  Replace the compressor.
2. Compressor wiring trouble 
(missing phase)
Compressor
breakdown
 Starts to operate but 
operating frequency 
drops and 
compressor stops.Inverter stops after alarm is 
detected.1. Check power voltage: AC 
2. Refrigerant cycle overload 
operation
3. Check AC current detection 
circuit.
Inverter control PCB 
position detection 
circuit troubleInverter stops after alarm is 
detected.Position detection circuit is 
activated even when the 
compressor 3P connector is 
disconnected and the 
compressor operated.
  Replace the inverter control 
PCB.
Disconnection, open 
circuit, or short circuit 
in discharge temp. 
sensor (TD)Sensor detection trouble
minutes have elapsed after 
compressor stopped).
(Open circuit)Automatic recovery
Automatic recovery1. Check discharge temp. 
sensor (TD).
2. Check outdoor unit control 
PCB.
Open circuit or short circuit Disconnection, open 
circuit, or short circuit 
in outdoor heat 
exchanger temp. 
sensor (C1)1. Check outdoor heat 
exchanger temp. sensor (C1).
2. Check outdoor unit control 
PCB.
Remote
controller
alarm display
Open circuit or short circuit Automatic recover y
2. Check outdoor unit control 
PCB.
y r e v o c e r c i t a m o t u A t i u c r i c t r o h s r o t i u c r i c n e p O 2 1 F Disconnection, open 
circuit, or short circuit 
in intake temp. sensor 
(TS)1. Check intake temp. sensor 
(TS).
2. Check outdoor unit control 
PCB.203 V ± 20 V or 230 V ± 23 V.
26, 36 MODEL:
42 MODEL:
Sensor defection trouble
(194°F or higher when 60
minutes have elapsed after 
compressor stopped). 
(Open circuit) 
F07Disconnection, open 
circuit, or short circuit 
in outdoor heat 
exchanger temp. 
sensor (C2)1. Check outdoor heat 
exchanger temp. sensor (C2). 
Open circuit or short circuit Automatic recovery
2. Check outdoor unit control 
PCB. F08Disconnection, open 
circuit, or short circuit 
in outdoor air temp. 
sensor (TO)  1. Check outdoor air temp. 
sensor (TO).  (194°F or higher when 15 
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