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Model
CS-TZ20TKEW CS-TZ25TKEW CS-TZ35TKEW CS-TZ42TKEW CS-MTZ16TKE CU-TZ20TKE CU-TZ25TKE CU-TZ35TKE CU-TZ42TKE
Pages
127
Size
23.23 MB
Type
PDF
Document
Service Manual
Brand
Device
Air Conditioner / AIR CONDITIONER
File
cs-tz20tkew-cs-tz25tkew-cs-tz35tkew-cs-tz42tkew-cs.pdf
Date
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Panasonic CS-TZ20TKEW / CS-TZ25TKEW / CS-TZ35TKEW / CS-TZ42TKEW / CS-MTZ16TKE / CU-TZ20TKE / CU-TZ25TKE / CU-TZ35TKE / CU-TZ42TKE Service Manual ▷ View online

97 
Diagnosis 
display 
Abnormality / 
Protection control 
Abnormality 
Judgment 
Protection 
Operation 
Problem Check 
location 
H41 
Abnormal wiring or 
piping connection 
— — 
Wrong wiring and 
connecting pipe, expansion 
valve abnormality 
 Check indoor/outdoor 
connection wire and connection 
pipe 
  Expansion valve and lead wire 
and connector 
H59 
ECONAVI sensor 
abnormality 
Continuous for 25s 
— 
ECONAVI sensor open or 
short circuit 
  ECONAVI sensor (defective or 
disconnected) 
 ECONAVI PCB 
H64 
Outdoor high 
pressure sensor 
abnormality 
Continuous for 1 
minutes 
— 
High pressure sensor open 
circuit during compressor 
stop 
  High pressure sensor 
  Lead wire and connector 
H67 Nanoe 
abnormality 
Nanoe stop for 5 
minutes for 3 times 
— Nanoe 
faulty 
 PCB 
 Nanoe system 
 High voltage 
H70 
Light sensor 
abnormality 
Continuous for 24 
hours, 15 days 
— 
Light sensor open or short 
circuit 
  Light sensor (defective or 
disconnect) 
H97 
Outdoor fan motor 
mechanism lock 
2 times happen 
within 30 minutes 
— 
Outdoor fan motor lock or 
feedback abnormal 
  Outdoor fan motor lead wire 
and connector 
  Fan motor lock or block 
H98 
Indoor high pressure 
protection 
— — 
Indoor high pressure 
protection (Heating) 
  Check indoor heat exchanger 
  Air filter dirty 
  Air circulation short circuit 
H99 
Indoor operating unit 
freeze protection 
— — 
Indoor freeze protection 
(Cooling) 
  Check indoor heat exchanger 
  Air filter dirty 
  Air circulation short circuit 
F11 
4-way valve 
switching 
abnormality 
4 times happen 
within 30 minutes 
— 
4-way valve switching 
abnormal 
 4-way valve 
  Lead wire and connector 
F17 
Indoor standby units 
freezing abnormality 
3 times happen 
within 40 minutes 
— 
Wrong wiring and 
connecting pipe, expansion 
valve leakage, indoor heat 
exchanger sensor open 
circuit 
 Check indoor/outdoor 
connection wire and pipe 
  Indoor heat exchanger sensor 
lead wire and connector 
  Expansion valve lead wire and 
connector 
F90 
Power factor 
correction 
(PFC) circuit 
protection  
4 times happen 
within 10 minutes 
— 
Power factor correction 
circuit abnormal 
  Outdoor PCB faulty 
F91 
Refrigeration cycle 
abnormality 
2 times happen 
within 20 minutes 
— 
Refrigeration cycle 
abnormal 
  Insufficient refrigerant or valve 
close 
F93 
Compressor 
abnormal revolution 
4 times happen 
within 20 minutes 
— 
Compressor abnormal 
revolution 
  Power transistor module faulty 
or compressor lock 
F94 
Compressor 
discharge overshoot 
protection 
4 times happen 
within 30 minutes 
— 
Compressor discharge 
pressure overshoot 
  Check refrigeration system 
F95 
Outdoor cooling high 
pressure protection 
4 times happen 
within 20 minutes 
— 
Cooling high pressure 
protection 
  Check refrigeration system 
  Outdoor air circuit 
F96 
Power transistor 
module overheating 
protection 
4 times happen 
within 30 minutes 
— 
Power transistor module 
overheat 
 PCB faulty 
  Outdoor air circuit (fan motor) 
F97 
Compressor 
overheating 
protection 
3 times happen 
within 30 minutes 
— Compressor 
overheat 
 Insufficient refrigerant 
F98 
Total running current 
protection 
3 times happen 
within 20 minutes 
— Total 
current 
protection 
  Check refrigeration system 
  Power source or compressor 
lock 
F99 
Outdoor direct 
current (DC) peak 
detection 
Continuous 
happen for 7 times 
— 
Power transistor module 
current protection 
  Power transistor module faulty 
or compressor lock 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
98 
18.4 Self-diagnosis 
Method 
18.4.1  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
●
Replace the PCB
of outdoor unit PCB
●
Improper connection at terminals
●
Check indoor/outdoor connecting cable
indoor/outdoor
●
Improper connection at terminals
●
Defect in receiver/transmitter module of
●
Replace the indoor unit PCB
●
Check indoor/outdoor connecting cable
indoor/outdoor
the communication circuitry in indoor
unit PCB
Measure the DC voltage at terminal 2 & 3 (communication
terminals) of outdoor unit terminal board
Is the measured DC voltage fluctuate between 10~70V?
Measure the AC voltage at terminal 1 & 2 of indoor unit
terminal board
Is the measured voltage 230/240V?
YES
Measure the DC voltage at terminal 2 & 3 of indoor unit
terminal board
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
 
 
 
 
 
 
 
 
 
 
 
99 
18.4.2  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 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
100 
18.4.3  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 
 
 
 
 
 
 
 
 
 
 
 
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