Malfunction Of System, Refrigerant System Address Undefined - Panasonic Urban Multi MX1R Series Service Manual

PACD011001C2
3.36

Malfunction of System, Refrigerant System Address Undefined

UH UH UH UH
Remote Controller
Display
„ Improper connection of transmission wiring between indoor-outdoor unit and outdoor-outdoor unit
Supposed Causes
„ Defect of indoor unit PC board
„ Defect of outdoor unit PC board (A1P)
Troubleshooting
Troubleshooting Urban Multi "MX1, ME1 Series" Using R-22
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Is electricity
being introduce for
YES
the first time after installation
or after an indoor or outdoor
unit PC board has
been replaced?
NO
Is
indoor - outdoor and
outdoor - outdoor unit
transmission wiring
normal?
YES
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
minutes elapses from the time
when electricity is introduced
to indoor and outdoor
units?
YES
NO
NO
NO
Troubleshooting
NO
Normal.
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.
Normal.
Replace indoor unit PC board.
Replace outdoor unit PC board
(A1P).
(VF062)
191