Panasonic CS-Z20TKR Service Manual page 126

17.4.9 H25 (nanoe-G Air Purifying System Abnormal)
Malfunction Decision Conditions

During standby of cooling and heating operation, nanoe-G breakdown occurs and air conditioner stops operation.
Malfunction Caused

Faulty indoor main PCB.

Faulty indoor nanoe-G power module.
Troubleshooting
When abnormality indication starts again
Check the indoor unit main PCB CN-CLN terminal 4 & 2 DC
voltage:
● Turn off the power
● Disconnect the CN-CLN connector
● Turn on the power, measure the DC voltage between
CN-CLN terminal 4 & 2
Is the DC voltage measured at 5Vdc?
● Turn off the power, and reconnect CN-CLN connector
● Turn on the power, and measure again the DC voltage
between CN-CLN channel 4 & 2
Is the voltage measured at 5Vdc?
YES
NO
YES
NO
126
For safety reason and to prevent component
breakdown, always switch off the power
before remove and connect the component.
HV(-)
4 4
W
W
GND
W
G
W
1 1
HV(+)
nanoe-G power
● Defect in indoor main PCB
● Replace the indoor unit main PCB
● Defect in indoor unit nanoe-G power module
● Replace the indoor unit nanoe-G power module
● Defect in indoor unit main PCB
● Replace the indoor unit main PCB
BL
G
W
WIRE HOLDER
module