Daikin ERQ, Service Manual

Page: 177 / 260

ESIE09-05 Troubleshooting by Indication on the Remote Controller
Troubleshooting 167
3.3 “
A6
” AHU: Fan Motor (M1F) Lock, Overload
Remote
Controller
Display
A6
Applicable
Models
All AHU models
Method of
Malfunction
Detection
Detection by failure of signal for detecting number of turns to come from the fan motor
Malfunction
Decision
Conditions
When number of turns can’t be detected even when output voltage to the fan is maximum
Supposed
Causes
„ Fan motor lock
„ Disconnected or faulty wiring between fan motor and PC board
Troubleshooting
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Connect the wiring and turn on
again.
Fix the wiring and turn on again.
YES
NO
NO
NO
YES
YES
Replace the AHU PC board.
Replace the fan motor.
Is the
wiring from the fan
motor securely connected
to connectors on the
AHU PC
board?
Wiring
between the
AHU PC board and
fan motor is
disconnected.
Does the fan motor run?
(V2779)
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