d16
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
comes into contact with a cold
source, such as low-temperature
condensed water and cold
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 cold 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 exceeds 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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