Troubleshooting by Indication on the Remote Controller ESIE09-08B
208 Troubleshooting
3.63 “UH ” Malfunction of System, Refrigerant System Address
Undefined
Remote Control
Display
UH
UH
subcode 0
Applicable
Models
AII indoor unit models
All outdoor unit models
Method of
Malfunction
Detection
Malfunction
Deci
sion
Conditions
Supposed
Causes
Improper connection of transmission wiring between outdoor unit and outdoor unit outside
control adapter
Defect of indoor unit PC board (A1P)
Defect of outdoor unit PC board (A1P)
Troubleshooting
Caution
Be sure to turn off power switch before connect or disconnect
connector, or parts damage may be occured.
(V2831)
NO
YES
Fix incorrect wiring,
push and hold the RESET
button on the master outdoor
unit PC board for 5 seconds.
Normal
NO
Is
electricity
being introduce for
the first time after
installation or after an indoor
or outdoor unit PC
board has been
replaced?
Is
indoor -
outdoor
transmission wiring
normal?
YES
NO
Does a
"UH " malfunction
occur without
subcode “0”?
YES
NO
Does a
malfunction occur
even after 12 minutes
elapses from the time when
electricity is introduced
to indoor and
outdoor
unit?
YES
Replace indoor unit PC board (A1P).
Replace outdoor unit PC
board (A1P).
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