Daikin ERQ, Service Manual

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ESIE09-05 Troubleshooting by Indication on the Remote Controller
Troubleshooting 179
3.13 “
CC
” AHU: Malfunction of Humidity Sensor System
Remote
Controller
Display
CC
Applicable
Models
FXFQ
Method of
Malfunction
Detection
Even if a malfunction occurs, operation still continues.
Malfunction is detected according to the moisture (output voltage) detected by the moisture
sensor.
Malfunction
Decision
Conditions
When the moisture sensor is disconnected or short-circuited
Supposed
Causes
„ Faulty sensor
„ Disconnection
Troubleshooting
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
YES
NO
YES
NO
Remove the humidity sensor
from the indoor PC board and
insert it again.
It is normal.
(Poor connector contact)
Replace the humidity sensor
PC board ASS'Y (A2P).
*3
It is believed that external factors
(noise or else) other than failure
caused the malfunction.
*1: To delete the record, the ON/OFF button of the remote controller must be pushed and
held for 5 seconds in the check mode.
*2: To display the code, the Inspection/Test Operation button of the remote controller must be
pushed and held in the normal mode.
*3: If "
++
" is displayed even after replacing the humidity sensor PC board ASS'Y (A2P) and
taking the steps *1 and 2, replace the indoor PC board ASS'Y (A1P).
Does it
function normally?
Is "
++
"
displayed on
the remote
controller? (*2)
Delete the malfunction code
record from the remote
controller. (*1)
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