Friedrich MC24Y3J - Page 50

- 50 -
Only for training and service purposes
Check the Volt.
Indoor Unit
V
12Vdc
12V
(RD)
S
(YL)
S
(YL)
GND
(BK)
Check the Volt.
Wired R/C
V
12Vdc
12V
(RD)
GND
(BK)
Check the wire
connection(Open /
Short / Miswirring)
Is it normal ?
Check the volt. of main
PCB power source.
(DC 12V,DC 5V)
Is the soldering state
of connector is normal?
Yes
Yes
No
Correct connection
Or change connection wire
Is it normal ?
Yes
No
Correct connection
Or change the PCB
Check the installation of
wired remote controller.
(Noise interference)
Is it normal ?
No
Adjust the state
of installation
No
Re-soldering component
Or change the PCB
Check Flow Chart
CN-REMO
03
Communication Error
(Wired remote controller)
• Connector connection
error
• Faulty PCB / Remote
controller
• Connection wire break
• Connection of wire
• Main PCB Volt. DC12V
• Noise interference
Display
code
Title Cause of error Check point & Normal condition
Check Point
1. Check the wire connection. (Open / Short) ’ Repair the connection
2. Check the soldering state of connector. (Soldered poorly) ’ Repair or Change the PCB.
3. Check the volt. Of main PCB power source. (DC 12V) ’ Repair or Change the main PCB.
4. Check the installation of wired remote controller. (Noise interference) ’ Adjust the state of installation