Daikin VRVIII-S, Service Manual

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Troubleshooting by Indication on the remote control SiENBE34-703
180 Troubleshooting
3.48 “
UH
” Malfunction of System, Refrigerant System Address
Undefined
remote control
Display
UH
Applicable
Models
AII indoor unit models
RXYSQ4~6P
Method of
Malfunction
Detection
Malfunction
Decision
Conditions
Supposed
Causes
!
Improper connection of transmission wiring between outdoor unit and outdoor unit outside
control adapter
! Defect of indoor unit PC board
! Defect of outdoor unit PC board (A1P)
Troubleshooting
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
(V2831)
Caution
After fixing incorrect wiring,
push and hold the RESET
button on the master outdoor
unit PC board for 5 seconds.
Normal
Is
electricity
being introduced
for the first time after
installationor after an indoor
or outdoor unit PC
board has been
replaced?
Is indoor
- outdoor and outdoor -
outdoor unit transmission
wiring normal?
Normal
Does a malfunction occur?
Does a
"UH" malfunction
occur for all indoor units
in the system?
Does a
malfunction
occur even after 12
minutes elapses from the
time when electricity is
introduced to indoor
and outdoor
units?
Replace indoor unit 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.
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO