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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69 
16.4 Self-diagnosis 
Method 
16.4.1  H11 (Indoor/Outdoor Abnormal Communication) 
Malfunction Decision Conditions 
  During startup and operation of cooling and heating, the data received from outdoor unit in indoor unit signal 
transmission is checked whether it is normal. 
 
Malfunction Caused 
  Faulty indoor unit PCB. 
  Faulty outdoor unit PCB. 
  Indoor unit-outdoor unit signal transmission error due to wiring error. 
  Indoor unit-outdoor unit signal transmission error due to breaking of wire in the connection wires between the 
indoor and outdoor units. 
 
Troubleshooting 
 
 
 
 
 
 
 
 
 
 
YES 
YES 
YES 
NO
When abnormality indication starts again 
Measure the AC voltage at terminal 1 & 2 of outdoor unit
terminal board  
Is the measured voltage 230/240V? 
●  AC power supply abnormal fluctuation
●  Defect in communication circuitry
of outdoor unit PCB
● Replace 
the 
PCB
●
Measure the DC voltage at terminal 2 & 3 (communication
Is the measured DC voltage fluctuate between 10~70V?
Measure the AC voltage at terminal 1 & 2 of indoor unit
Is the measured voltage 230/240V? 
YES
Measure the DC voltage at terminal 2 & 3 of indoor unit
Is the measured DC voltage fluctuate between 10~70V?
For safety reason and to prevent 
component breakdown, always switch 
off the power before remove and 
connect the component. 
Caution
NO
NO
NO
terminals) of outdoor unit terminal board 
(Value depend on multimeter accuracy)  
terminal board  
terminal board  
Improper connection at terminals
●
Check indoor/outdoor connecting cable
indoor/outdoor 
●
Improper connection at terminals
●
Check indoor/outdoor connecting cable
indoor/outdoor 
●
Defect in receiver/transmitter module of
the communication circuitry in indoor 
●
Replace the indoor unit PCB
unit PCB
70 
16.4.2  H12 (Indoor/Outdoor Capacity Rank Mismatched) 
Malfunction Decision Conditions 
  During startup, error code appears when different types of indoor and outdoor units are interconnected. 
 
Malfunction Caused 
  Wrong models interconnected. 
  Wrong indoor unit or outdoor unit PCBs mounted. 
  Indoor unit or outdoor unit PCBs defective. 
  Indoor-outdoor unit signal transmission error due to wrong wiring. 
  Indoor-outdoor unit signal transmission error due to breaking of wire 3 in the connection wires between the indoor 
and outdoor units. 
 
Troubleshooting 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
71 
16.4.3  H14 (Indoor Intake Air Temperature Sensor Abnormality) 
Malfunction Decision Conditions 
  During startup and operation of cooling and heating, the temperatures detected by the indoor intake air 
temperature sensor are used to determine sensor errors. 
 
Malfunction Caused 
 Faulty 
connector 
connection. 
 Faulty 
sensor. 
 Faulty 
PCB. 
 
Troubleshooting 
 
 
 
 
 
 
 
 
 
 
 
72 
16.4.4  H15 (Compressor Temperature Sensor Abnormality) 
Malfunction Decision Conditions 
  During startup and operation of cooling and heating, the temperatures detected by the outdoor compressor 
temperature sensor are used to determine sensor errors. 
 
Malfunction Caused 
 Faulty 
connector 
connection. 
 Faulty 
sensor. 
 Faulty 
PCB. 
 
Troubleshooting 
 
 
 
 
 
 
 
 
 
 
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