Troubleshooting by Indication on the Remote Controller ESIE09-05
216 Troubleshooting
3.44 “UF” System is not Set yet
Remote
Controller
Display
UF
Applicable
Models
All models of AHUs
RXYSQ4~6PA
Method of
Malfunction
Detection
On check operation, the number of AHUs in terms of transmission is not corresponding to that
of AHUs that have made changes in temperature.
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 AHUs-outdoor units and outdoor-
outdoor units
Failure to execute check operation
Defect of AHU 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 AHUs 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
AHU - outdoor
and outdoor - outdoor unit
transmission wiring
normal?
Replace AHU 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.
∗ The unit will not run for up to
12 minutes.
YES
NO
YES
NO
NO
YES
Is the
check operation
carried out?
Is AHU
- outdoor and
outdoor-outdoor unit
transmission wiring
normal?
Open stop valve.
YES
NO
Are the stop
valves opened?
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