Panasonic Cs Kexxnb4x Cz 18bt1u Service Manual

< Clock display >
Test run mode
Self-diagnostics mode
9.  TROUBLESHOOTING (BEFORE CALLING FOR SERVICE)
9-1.  Precautions before Performing Inspection or Repair
NOTE
After checking the self-diagnostics monitor, turn the power OFF before starting inspection or repair.
High-capacity electrolytic capacitors are used inside the outdoor unit controller (inverter). They retain an electrical charge 
(charging voltage DC 310V) even after the power is turned OFF, and some time is required for the charge to...

  Since the indications cover various units, the corresponding parts listed below may not be  present in some models.
(1) Self-diagnostics Lamps
(1) DRAIN PUMP FAILURE   (2) FS FAILURE  (3) CHOKED DRAIN HOSE
8512-5261-99100-1
REMOTE CONTROL receiver
OPERATION lamp 
TIMER lamp OPERATION button
HIGH POWER lamp
INDOOR UNIT
TIMER
LAMPBLINKING (3 SEC. INTERVAL)FLOAT SWICTH (FS) IS ACTIVED.
.... 
OFF
CODE DIAGNOSIS CONTENTS POSSIBLE MALFUNCTION
ROOM TEMP. SENSOR TROUBLE
I/D HEAT EXCHANGER TEMP. 
SENSOR...

(2) If the self-diagnostics function fails to operate
Check the indoor unit.
Is the fuse blown?
Replace the controller.Replace the circuit
board or the fuse. No indicators illuminate and the 
indoor fan does not rotate.
Check the power voltage. •
•
NormalBlown
9-3. Checking the Indoor and Outdoor Units
(1) Checking the indoor unit
(2) Checking the outdoor unit
 Using the TEST/T-RUN terminalsControl No. Check items (unit operation)
T-RUN : Test run (compressor and fan motor turn ON).
TEST/MV : Compresses...

(3) Serial Communication Error Identification Procedure
Refer to "Method of Self-Diagnostics" for the self-diagnostics procedure.
(3-1) Condition: E01< Before the Operation > If the lamps on the main body show the following conditions after the completion of self-diagnostics,
a communication error between the indoor unit and outdoor unit might be considered.
In such a case, identify the breakdown section by using the following procedure.
Troubleshooting Serial Communication
Is the voltage of...

What is the latest self-diagnosis result ?Condition: E12Defect in the outdoor unit
P.C. board.
Condition: E01
Defect or connection error
in the inter-unit cable
Defect in the indoor unit
P.C. board
( Continued from the previous page A. )
A( Continued from the previous page B. )
B
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123
Outdoor Unit
Power
Fig. 3 Indoor Unit
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Outdoor Unit
Powe r
Fig. 4 Indoor Unit
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Outdoor Unit
Powe r
Fig. 5 Indoor Unit
Condition: E12
Condition: E01
1. Turn OFF the power and wait until the power...

(3-2) Condition: E12
Troubleshooting Serial Communication
1. Turn off the power and wait until the power lamp (LED)
  of the outdoor unit controller is turned OFF.
2. Disconnect the cable from the terminal 3 on the indoor
  unit terminal strip.                                        (Fig. 7)
Defect in the indoor unit
P.C. board
Defect in the outdoor unit
P.C. board
1. Turn ON the power and operate the system using the
  remote controller or the operation button on the indoor unit.
2. Perform the...

[Trouble symptom 3] Motor rotates for some time (several seconds), but then quickly stops, when the indoor unit 
operates.
(There is trouble in the system that provides feedback of motor rotation speed from the 
motor to the indoor unit controller.)
[Trouble symptom 4] Fan motor rotation speed does not change during indoor unit operation.
[Trouble symptom 5] Fan motor rotation speed varies excessively during indoor unit operation.
(Remedy for symptom 3 to 5)
It is not possible to identify whether the...

 
9-4-2.  Outdoor Fan Motor
This outdoor DC fan motor contains an internal control PCB. Therefore, it is not possible to measure the coil 
resistance, and the following procedure should be used to check the motor.
Perform the trouble diagnosis by Test Run mode described on Installation Instructions.
[Trouble symptom 1] The fan does not stop when the outdoor unit stops.    Outdoor unit controller trouble
[Trouble symptom 2]  The fan motor does not rotate when the outdoor unit is operating.
(Diagnostic...

9-5.  Noise Malfunction and Electromagnetic Interference
An inverter A/C operates using pulse signal control and high frequencies. Therefore, it is susceptible to the effects of external 
noise, and is likely to cause electromagnetic interference with nearby wireless devices. 
A noise filter is installed for ordinary use, preventing these problems. However, depending on the installation conditions, these 
effects may still occur. Please pay attention to the points listed below.
(1) Noise malfunction
This...

Insulation 
tester
Probe
Clip
Ground wire
Terminal plate
Copper
tube or
metallic partClip
Insulation 
testerProbe
Fig. 1
Fig. 2
Fig. 3
Fig. 4
Copper
tube or
metallic partClip
Insulation 
testerProbe
Clip
Insulation 
tester Probe
Metallic 
partFrom fan motor,
compressor and 
other parts
10.  CHECKING ELECTRICAL COMPONENTS
10-1.  Measurement of Insulation 
Resistance
The insulation is in good condition if the resistance 
exceeds 1M ohm.
10-1-1. Power Supply Cord
Clamp the grounding wire of power cord with...