Panasonic CS-Z25UFEAW Service Manual

95
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
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

Panasonic CS-Z25UFEAW Specifications

General

Brand	Panasonic
Model	CS-Z25UFEAW
Category	Air Conditioner
Language	English