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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Panasonic CS-MZ20UD3EA Service Manual ▷ View online

81 
16.4.13  H33 (Unspecified Voltage between Indoor and Outdoor) 
Malfunction Decision Conditions 
  The supply power is detected for its requirement by the indoor/outdoor transmission. 
 
Malfunction Caused 
  Wrong models interconnected. 
  Wrong indoor unit and outdoor unit PCBs used. 
  Indoor unit or outdoor unit PCB defective. 
 
Troubleshooting 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
82 
16.4.14  H36 (Outdoor Gas Pipe Sensor Abnormality) 
Malfunction Decision Conditions 
  During startup and operation of cooling and heating, the temperatures detected by the outdoor gas pipe 
temperature sensor are used to determine sensor errors. 
 
Malfunction Caused 
 Faulty 
connector 
connection. 
 Faulty 
sensor. 
 Faulty 
PCB. 
 
Troubleshooting 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
83 
16.4.15  H37 (Outdoor Liquid Pipe Temperature Sensor Abnormality) 
Malfunction Decision Conditions 
  During startup and operation of cooling and heating, the temperatures detected by the outdoor liquid pipe 
temperature sensor are used to determine sensor errors. 
 
Malfunction Caused 
 Faulty 
connector 
connection. 
 Faulty 
sensor. 
 Faulty 
PCB. 
 
Troubleshooting 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
84 
16.4.16  H97 (Outdoor 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. 
 
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 outdoor unit PCB. 
 
 
Troubleshooting 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
FAN MOTOR
CN-MTR2 
(WHT)
10
1 
W
MS 
3 
U
5
V
14
16
IC19
CN-MTR1
1
2
R105
1k
3
4
5
5V
R111
R120 
1k
1k
+
C173
C175 
0.01μ
50V
G5
G5
G5
C177
C176
0.01μ 
0.01μ
50V 
50V
G5
PCB BOARD
Replace fan motor.
Replace outdoor PCB.
Replace fan motor.
Replace fan motor.
Replace outdoor PCB.
Does it rotate?
Is the resistance normal?
Use an inverter check to check on 
the power transistor on board.
Connect it to PCB’s CN-MRT2 port. 
Turn power ON and run the unit.
Do all 6 LED light turn ON and turn 
OFF periodically?
Does the voltage at each terminal 
becomes 5 and 0Vdc repeatedly?
U
NO
YES
V
W
NO
YES
NO
YES 
NO
YES
When abnormality indication starts again
Turn off power supply and rotate fan by 
hand.
Caution
For safety reason and to prevent 
component breakdown, always switch 
off the power before remove and 
connect the component.
Does fan rotate smoothly?
NO
Replace fan motor.
YES
Turn power supply on and operate fan.
Turn off power supply and 
disconnect fan motor CN-MRT2 
connector.
Check resistance of the motor. 
Measure at fan motor connector 
CN-MRT1 (1-2, 1-3, 2-3).
Stop the fan motor
Check the rotation feedback output from 
fan motor’s CN-MTR1 output.
Rotate the fan motor manually (by hand) 
while measure the voltage at PCB’s
CN-MRT1
- Between 1(+) and 5(-)
- Between 2(+) and 5(-)
- Between 3(+) and 5(-)
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