Daikin ERQ, Service Manual

Page: 227 / 260

ESIE09-05 Troubleshooting by Indication on the Remote Controller
Troubleshooting 217
3.45 “
UH
” Malfunction of System, Refrigerant System Address
Undefined
Remote
Controller
Display
UH
Applicable
Models
AII AHU models
RXYSQ4~6PA
Method of
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
„ Improper connection of transmission wiring between outdoor unit and outdoor unit outside
control adaptor
„ Defect of AHU PC board
„ Defect of outdoor unit PC board (A1P)
Troubleshooting
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
(V2831)
NO
YES
YES
After fixing incorrect wiring,
push and hold the RESET
button on the master outdoor
unit PC board for 5 seconds.
Normal
NO
Is
electricity
being introduce for
the first time after
installationor after an AHU
or outdoor unit PC
board has been
replaced?
Is
AHU - outdoor and
outdoor - outdoor unit
transmission wiring
normal?
YES
Normal
NO
Does a malfunction occur?
NO
Does
a "
70
" malfunction occur
for all AHUs in
the system?
YES
NO
Does
a malfunction
occur even after 12
minutes elapses from the
time when electricity is
introduced to AHU
and outdoor
units?
YES
Replace AHU PC board.
Replace outdoor unit PC
board (A1P).
After fixing incorrect wiring,
push and hold the RESET
button on the outdoor unit
PC board for 5 seconds
∗
The unit will not run for up to
12 minutes.
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