Daikin REYQ72, Serveice Manual

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SiUS39-602 Troubleshooting by Indication on the Remote Controller
Troubleshooting 191
2.54
“
UF
”
System is not Set yet
Remote
Controller
Display
UF
Applicable
Models All indoor units models
REYQ72M, 96M
Method of
Malfunction
Detection The number of indoor units in terms of data transmission becomes mismatched to that of indoor
units with changes in temperature on operation for checks.
Malfunction
Decision
Conditions The malfunction is determined as soon as the abnormality aforementioned is detected through
checking the system for any erroneous connection of units on the check operation.
Supposed
Causes
„
Improper connection of transmission wiring between indoor-outdoor unit and outdoor unit-
external control adaptor for outdoor unit
„
Failure to execute check operation
„
Defect of indoor unit PC board
„
Stop valve is left in closed.
Troubleshooting
Note: Wiring check operation may not be successful if carried out after the outdoor unit has been off
for more than 12 hours, or if it is not carried out after running all connected indoor units in the
fan mode for at least an hour.
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
(V2830)
Is
indoor - outdoor
and outdoor - outdoor unit
transmission wiring
normal?
Replace indoor unit PC board.
Wiring check operation may
not have been carried out
successfully.
After fixing incorrect wiring,
push and hold the RESET
button on the master outdoor
unit PC board for 5 seconds.
(Wiring check operation)
YES
NO
YES
NO
NO
YES
Is the
check operation
carried out?
Is indoor
-outdoor and outdoor-
outdoor unit transmission
wiring normal?
Open stop valve.
YES
NO
Are the stop
valves openned?
∗
The unit will not run for up to
12 minutes.