PACD011001C2 Troubleshooting
Troubleshooting UM Combination “MA1R Series” Using R-407C 499
3.2 Indoor Unit: PC Board Defect
Remote Controller
Display
A1
Supposed Causes
„
Defect of indoor unit PC board
Troubleshooting
Turn power supply OFF, then
power ON again.
Does the system return to
normal?
YES
External factor other than
malfunction (for example, noise
etc.).
Replace the indoor unit PC
board.
(V0816)
NO
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
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