Friedrich MD24Y3J Svc Manual page 50

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