Daikin D-Series User Manual

Troubleshooting for SkyAir Indoor Unit Si18-525B
352 Troubleshooting
5.10 Malfunction of Suction Air Thermistor
Remote
Controller
Display
C9
Applicable
Models
FFQ, FCQ, FBQ, FHQ
Method of
Malfunction
Detection
Malfunction detection is carried out by temperature detected by suction air temperature sensor.
Malfunction
Decision
Conditions
When the suction air temperature sensor’s thermistor becomes disconnected or shorted while
the unit is running.
Supposed
Causes

Failure of the sensor itself

Broken or disconnected wire

Failure of indoor unit PCB

Failure of connector contact
Troubleshooting
Check No.02
Refer to P.358
Disconnect the sunction air
temperature sensor (R1T)
from X19A on the indoor unit
PCB and measure the
resistance.
Connect correctly.
Suction air temperature
sensor replacement.
If contact is OK, replace
outdoor unit PCB.
Is the
thermistor normal?
(See note)
NO
YES
(Q0418)
NO
YES
Check contact of connector
Is it normal?
+See Check No. 02 for “Thermistor temperature and resistance characteristics”.
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.

Daikin D-Series Specifications

General

HSPF Rating	Up to 10.0
Cooling Capacity	9, 000 - 36, 000 BTU/h
Heating Capacity	9, 000 - 36, 000 BTU/h
Energy Efficiency Ratio (EER)	Up to 12.5
Sound Level	19 - 50 dB (Indoor), 49 - 60 dB (Outdoor)
Noise Level	19 - 50 dB (Indoor), 49 - 60 dB (Outdoor)
Power Supply	208/230V, 1-phase, 60Hz