Uh" Malfunction Of System, Refrigerant System Address Undefined - Daikin VRVIII-S Service Manual

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