Uh" Malfunction Of System, Refrigerant System Address Undefined - Daikin ALTHERMA HT ERSQ 011 AA Service Manual

Troubleshooting by Indication on the Remote Controller
3.63 "UH " Malfunction of System, Refrigerant System Address
Undefined
UH
Remote Control
UH
Display
Applicable Models AII indoor unit models
All outdoor unit models
Method of
Malfunction
Detection
Malfunction
Decision Conditions
 Improper connection of transmission wiring between outdoor unit and outdoor unit outside control
Supposed Causes
 Defect of indoor unit PC board (A1P)
 Defect of outdoor unit PC board (A1P)
Troubleshooting
installation or after an indoor
218
subcode 0
adapter
Be sure to turn off power switch before connecting or disconnecting connector,
Caution
otherwise parts may be damaged.
Is
electricity
being introduce for
the first time after
YES
or outdoor unit PC
board has been
replaced?
NO
Is
indoor -
NO
outdoor
transmission wiring
normal?
YES
Does a
"UH " malfunction
NO
occur without
subcode "0"?
YES
Does a
malfunction occur
even after 12 minutes
elapses from the time when
electricity is introduced
to indoor and
outdoor
unit?
YES
ESIE09-08A
NO
Normal
Fix incorrect wiring,
push and hold the RESET
button on the master outdoor
unit PC board for 5 seconds.
Replace indoor unit PC board (A1P).
Replace outdoor unit PC
board (A1P).
Troubleshooting
(V2831)