d17
Cause 4: If the error cannot be cleared
after causes 1/2/3 have been eliminated,
the main control board of the IDU is
damaged
Cause 3: The sensor body has come into
contact with a hot source, such as direct
sunlight or hot surface of a heat
exchanger, which causes the detected
value to be lower than the normal value
Cause 2: Remove the plug of the inlet air
temperature sensor from the main control
board of the IDU, measure its resistance
value, and compare it with the Table of
Sensor Resistance - Temperature
Characteristics (1). If the temperature that
corresponds to the resistance value
deviates from the actual inlet air
temperature by more than 5°C , the sensor
is damaged.
Replace the inlet air
temperature sensor
Replace the main
control board of the
IDU
Eliminate the
interference of
external hot source to
the sensor
Cause 1: Spot check the inlet air
temperature and measure the inlet air
temperature. If the point check result
is the same as the measured result
(error 1°C ), it is a normal protection
measure for the unit. Otherwise, refer to
cause 2/3/4
It is a normal
protection measure for
the IDU. When the
inlet air temperature is
lower than the set
value, the fault will be
cleared
Note:
1. The inlet air temperature sensor is commonly found in the fresh air IDUs (The sensor code is
defined as T0), and its resistance and temperature characteristics are similar to T1 - return air
temperature sensor. Please refer to the Table of Temperature Sensor Resistance Characteristics
listed in the Maintenance Manual to learn more about the sensor's features.
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