Panasonic WH-UD07JE5 - Page 210

210
19.5.21 Indoor-Control Panel Communication Abnormality (H76)
Malfunction Decision Conditions:
During standby and operation of cooling and heating, indoor-control panel error occur.
Malfunction Caused:
1 Faulty connector connection.
2 Faulty control panel.
3 Faulty indoor unit PCB (main).
Troubleshooting:
For safety reason and to prevent component breakdown,
always switch off the power before remove and connect the component.
Check the CN-REMOTE connector connection:
- Turn OFF the power
- Check the connector connection
Check the DC voltage from the indoor unit PCB (main):
- Plug out connector from the indoor unit PCB (main).
- Turn ON the power.
- Measure the DC voltage pin 1 & 4 of CN-REMOTE.
Is the CN-REMOTE
connector connection normal?
Is the remote controller
(control panel) voltage 5 Vdc
(pin 1 & 4) generated?
Check the control panel
cable connection.
Is the control panel cable
connection normal?
- Defect in cable connection.
- Replace control panel cable.
- Connector poor contact.
- Correct the connection.
- Defect in remote controller
(control panel).
- Replace the remote
controller (control panel).
- Defect in indoor unit PCB
(main).
- Replace the indoor unit PCB
(main).
Yes
Yes
Yes
No
No
No
Caution