ESIE09-05 Troubleshooting by Indication on the Remote Controller
Troubleshooting 175
3.9 “C5” AHU: Malfunction of Thermistor (R3T) for Gas Pipes
Remote
Controller
Display
C5
Applicable
Models
All AHU models
Method of
Malfunction
Detection
Malfunction detection is carried out by temperature detected by gas pipe thermistor.
Malfunction
Decision
Conditions
When the gas pipe thermistor becomes disconnected or shorted while the unit is running.
Supposed
Causes
Defect of AHU thermistor (R3T) for gas pipe
Defect of AHU PC board
Troubleshooting
∗ Refer to thermistor resistance / temperature characteristics table on P232.
(V2785)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Replace the AHU PC board.
Connect the thermistor and turn
on again.
NO
NO
Replace the thermistor (R3T).
YES
YES
Connector is
connected to X11A of
the AHU PC
board.
Resistance
is normal when
measured after
disconnecting the thermistor
(R3T) from the AHU
PC board.
(0.6kΩ~
360kΩ)
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