Mismatching Of Indoor Unit And Outdoor Unit - Daikin 4MXL-T Series Service Manual

Troubleshooting for SA Indoor Unit

6.12 Mismatching of Indoor Unit and Outdoor Unit

UA
Error Code
Error Decision Improper combination of indoor and outdoor units
Conditions
Supposed  Defective indoor unit PCB
Causes  Indoor-outdoor unit transmission wiring error
 Defective optional unit(s) wirings
 Improper power supply wiring of indoor unit
 Improper wiring of connecting wires between indoor/outdoor units
Troubleshooting
194
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Is the combination
of indoor/outdoor
units correct?
YES
Continuously
ON or OFF
Do the service
monitors of all the
indoor units blink?
Blink
Turn off the power supply.
Then, turn on the power
supply to restart the system.
Does the system conduct
normal operation?
YES
NO
Are the wirings
between indoor unit and
outdoor unit correctly
connected?
YES
Is the optional
units power supply
connected from the
indoor unit terminal
block No.1 and
No.2?
YES
Is the voltage
between No.1 and
No.2 on the indoor
unit terminal block
208 - 230
VAC?
YES
Are the wirings
NO
between indoor unit and
outdoor unit correctly
connected?
YES
SiUS121827E
Connect the indoor/outdoor
units correctly.
NO
Connect the wirings correctly.
NO
Connect the wirings correctly.
NO
Could be incorrect wiring.
Check again.
Check the power supply system
inside the indoor unit.
NO
Connect the wirings correctly.
Replace the indoor unit PCB
(control PCB).
Normal
(R24591)
Part 6 Service Diagnosis