Sinclair SDV 6 Service Manual page 105

8.1.36 E21, E24, E81 - T0 (fresh inlet air temperature sensor) short-circuits or cuts off, T1 (IDU return air
temperature sensor) short-circuits or cuts off, and TA (outlet air temperature sensor) short-circuits or
cuts off
Error display
Error impact
Error trigger
Error recovery
Possible cause
Troubleshooting
102
Digital display
The faulty IDU stops. Other IDUs of the same system: operate normally.
ODU of the same system: operate normally.
When detecting that the temperature sensor short-circuits or cuts off
Automatic recovery
 The temperature sensor is damaged.
 The sensor plug to the T0/T1/TA port in the IDU main control board is loose.
 The IDU main control board is damaged.
E21/E24/E81 (1)
temperature sensor plug
connecting to the IDU main
control board loose?
No
temperature sensor resistance
abnormal (2)?
No
Replace the main control
board of the IDU
Note:
1) The E21/E24/E81 code respectively corresponds to the T0/T1/TA temperature sensor. Check
the wiring nameplate to find the sensor port on the main control board.
2) Measure the resistance between two pins of the sensor plug with a multimeter. A resistance
value close to 0 indicates a short circuit has occurred in the temperature sensor, and a resistance
value close to infinity indicates an open circuit in the temperature sensor.
Is the
Yes
Is the
Yes
Display position
Panel, display box, and wired controller
Reconnect the plug tightly
Replace the temperature
sensor