C5" Ahu: Malfunction Of Thermistor (R3T) For Gas Pipes - Daikin ERQ Service Manual

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