Daikin REYQ8-48PY1B, Service Manual

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Troubleshooting by Indication on the Remote Controller SiBE37-701_B
357 Troubleshooting
3.55
“
U9
”
Indoor Unit: Malfunction of Transmission between
Indoor and Outdoor Units in the Same System
Remote
Controller
Display
U9
Applicable
Models All indoor unit models
REYQ8P~48P
Method of
Malfunction
Detection Detect malfunction signal for the other indoor units within the circuit by outdoor unit PCB.
Malfunction
Decision
Conditions When the malfunction decision is made on any other indoor unit within the system concerned.
Supposed
Causes
„
Malfunction of transmission within or outside of other system
„
Malfunction of electronic expansion valve in indoor unit of other system
„
Defect of PCB of indoor unit in other system
„
Improper connection of transmission wiring between indoor and outdoor unit
Troubleshooting
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Continue operation.
YES
Turn on all indoor units.
NO
NO
YES
All the units are
indicating “
U9
”.
"
U9
" has been
displayed for 2
minutes or more.
Re-diagnose by display after
passage of 2 minutes or more.
The outdoor unit PCB indicated by
the malfunction code
U9
is normal.
Check for the indoor unit of other
system, and then conduct
troubleshooting by diagnosis
according to the Malfunction Code
Flowchart.