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16.5.21 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 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 pin1 & 4 of CN-REMOTE
- Defect in remote controller
(control panel)
- Replace the remote
controller (control panel)
Yes
Is the remote controller
(control panel) voltage 5Vdc
(pin1 & 4) generated?
Yes
Check the CN-REMOTE connector connection:
- Turn OFF the power
- Check the connector connection
- Connector poor contact
- Correct the connection
No
Is the CN-REMOTE
connector connection normal?
- Defect in indoor unit PCB
(main)
- Replace the indoor unit PCB
(main)
No
Check the control panel
cable connection.
- Defect in cable connection
- Replace control panel cable
No
Is the control panel cable
connection normal?
Yes
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