ESIE09-05 Troubleshooting by Indication on the Remote Controller
Troubleshooting 177
3.11 “C9” AHU: Malfunction of Thermistor (R1T) for Suction
Air
Remote
Controller
Display
C9
Applicable
Models
AII AHU models
Method of
Malfunction
Detection
Malfunction detection is carried out by temperature detected by suction air temperature
thermistor.
Malfunction
Decision
Conditions
When the suction air temperature thermistor becomes disconnected or shorted while the unit is
running.
Supposed
Causes
Defect of AHU thermistor (R1T) for air inlet
Defect of AHU PC board
Troubleshooting
∗ Refer to thermistor resistance / temperature characteristics table on P232.
Caution
Replace the AHU PC board.
Connect the thermistor and turn
on again.
NO
NO
Replace the thermistor.
YES
YES
is connected to
the AHU
PC board.
Resistance
is normal when
measured after
disconnecting the thermistor
from the AHU
PC board.
(7.2kΩ~
112kΩ )
(V2786)
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Connector
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