DOWNLOAD Panasonic CS-MZ20UD3EA Service Manual ↓ Size: 14.93 MB | Pages: 103 in PDF or view online for FREE

Model
CS-MZ20UD3EA
Pages
103
Size
14.93 MB
Type
PDF
Document
Service Manual
Brand
Device
Air Conditioner / AIR CONDITIONER
File
cs-mz20ud3ea.pdf
Date
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73 
16.4.5  H16 (Outdoor Current Transformer) 
Malfunction Decision Conditions 
  An input current, detected by Current Transformer CT, is below threshold value when the compressor is 
operating at certain frequency value for 3 minutes. 
 
Malfunction Caused 
  Lack of gas 
  Broken CT (current transformer) 
  Broken Outdoor PCB 
 
Troubleshooting 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
74 
16.4.6  H19 (Indoor Fan Motor – DC Motor Mechanism Locked) 
Malfunction Decision Conditions 
  The rotation speed detected by the Hall IC during fan motor operation is used to determine abnormal fan motor 
(feedback of rotation > 2550 rpm or < 50 rpm) 
 
Malfunction Caused 
  Operation stops due to short circuit inside the fan motor winding. 
  Operation stops due to breaking of wire inside the fan motor. 
  Operation stops due to breaking of fan motor lead wires. 
  Operation stops due to Hall IC malfunction. 
  Operation error due to faulty indoor unit PCB.  
 
Troubleshooting 
 
 
 
 
 
 
 
 
 
 
 
 
75 
16.4.7  H23 (Indoor Pipe Temperature Sensor Abnormality) 
Malfunction Decision Conditions 
  During startup and operation of cooling and heating, the temperatures detected by the indoor heat exchanger 
temperature sensor are used to determine sensor errors. 
 
Malfunction Caused 
 Faulty 
connector 
connection. 
 Faulty 
sensor. 
 Faulty 
PCB. 
 
Troubleshooting 
 
 
 
 
 
 
 
 
 
 
 
 
 
76 
16.4.8  H24 (Indoor Pipe Temperature Sensor 2 Abnormality) 
Malfunction Decision Conditions 
  During startup and operation of cooling and heating, the temperatures detected by the indoor heat exchanger 
temperature sensor 2 are used to determine sensor errors. 
 
Malfunction Caused 
 Faulty 
connector 
connection. 
 Faulty 
sensor. 
 Faulty 
PCB. 
 
Troubleshooting 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
When abnormality indication starts again.
For safety reason and to prevent component
breakdown, always switch off the power
before remove and connect the component.
Connector poor contact.
Correct the connection.
Defect in outdoor unit PCB.
Replace the outdoor unit PCB.
Defect in outdoor intake air temperature sensor.
Replace the outdoor intake air temperature
sensor.
NO
NO
YES
YES
Check the connector connection:
Plug out connector from the indoor unit PCB.
Is the connector connection normal?
Measure the resistance of the indoor pipe temperature
sensor.
Check the outdoor air temperature sensor:
Is the measured resistance of the outdoor intake air
temperature sensor matches the value specified in its
characteristic chart?
Plug out connector from the outdoor unit PCB.
Measure the resistance of the outdoor intake air
temperature sensor.
Caution
Sensor (Thermistor)
Characteristics
70
60
50
R
e
s
is
ta
n
ce
(k
Ω
)
Temperature °C (°F)
40
30
20
10
-10
(14)
0
(32)
10
(50)
20
(68)
30
(86)
40
(104)
50
(122)
0
1 Pipe temp. Sensor
2 Intake Air Temp. Sensor
1
2
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