Uh" Malfunction Of System, Refrigerant System Address Undefined - Daikin R-410A Service Manual

SiBE39-402A
4.46 "UH" Malfunction of System, Refrigerant System Address
Undefined
UH
Remote
Controller
Display
Applicable
AII indoor unit models
Models AII outdoor unit models
Method of
Malfunction
Detection
Malfunction
Decision
Conditions
! Improper connection of transmission wiring between outdoor unit and outdoor unit outside
Supposed
Causes
! Defect of indoor unit PC board
! Defect of outdoor unit PC board (A1P)
Troubleshooting
Troubleshooting
control adaptor
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Is
electricity
being introduce for
the first time after
YES
installationor after an indoor
or outdoor unit PC
board has been
replaced?
NO
Is indoor
- outdoor and
outdoor - outdoor unit
transmission wiring
normal?
YES
After fixing incorrect wiring,
push and hold the RESET
button on the outdoor unit
PC board for 5 seconds
Does a malfunction occur?
YES
Does a
"UH" malfunction occur
for all indoor units in
the system?
YES
Troubleshooting by Indication on the Remote Controller
Does
a malfunction
occur even after 12
minutes elapses from the
time when electricity is
introduced to indoor
and outdoor
units?
YES
NO
NO
NO
NO
Normal
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.
Normal
Replace indoor unit PC board.
Replace outdoor unit PC
board (A1P).
(V2831)
165