Panasonic CS-TZ25ZKEW Service Manual page 155

18.4.17 H85 (WLAN Module abnormality)
Malfunction Decision Conditions

Initial Setting: Main PCB does not receive WLAN module data for 90 secs.

Normal Control: Main PCB does not receive WLAN module data for 10 mins repeating 2 times.
5V power to WLAN module is turned off for 2s.
o
After 2s, 5V power to WLAN module is turned on & start initial setting.
o
WLAN LED Off & Timer LED blinking.
o
Malfunction Caused

Faulty lead wire connector connection.

Faulty indoor unit PCB.

Faulty WLAN module.
Troubleshooting
When abnormality indication starts again.
Turn ON WLAN function. 5V supplied to WLAN module?
(Pin 1 & Pin 8)
Connector plug in properly.
Check WLAN module lead wire continuity
Comfort Cloud operation normal and WLAN LED is ON?
CN-WLAN
1
WLAN
Module
8
YES
5V
Rx
Tx
GND
For safety reason and to prevent component
breakdown, always switch off the power
before remove and connect the component.
NO
Replace main PCB.
Properly plug in connector.
NO
Change the lead wire.
Replace WLAN module.
NO
Change the main PCB.
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