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SiUS092230E
6.13 Unspecified Voltage (Between 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
Part 6 Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Is the combination
NO
of indoor/outdoor
units correct?
YES
Continuously
ON or OFF
Do(es) the indoor
unit service monitor(s)
blink?
Blink
Turn off the power supply.
Then, turn on the power
supply to restart the system.
NO
Does the system conduct
normal operation?
YES
Troubleshooting for FDMQ, FFQ Series
Are the wirings
NO
between indoor unit and
outdoor unit correctly
connected?
YES
Is the optional
units power supply
NO
connected from the
indoor unit terminal
block No.1 and
No.2?
YES
Is the voltage
between No.1 and
NO
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
Connect the indoor/outdoor
units correctly.
Connect the wirings correctly.
Connect the wirings correctly.
Could be incorrect wiring.
Check again.
Check the power supply system
inside the indoor unit.
Connect the wirings correctly.
Replace the indoor unit PCB
(control PCB).
Normal
(R24591)
155
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