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1A-10A - Air temperature sensor failure

Alarm conditions:

1A - Open circuit in supply air temperature circuit,

2A - Short circuit in supply air temperature circuit,

3A - Open circuit in extract air temperature circuit,

4A - Short circuit in extract air temperature circuit,

5A - Open circuit in outdoor air temperature circuit,

6A - Short circuit in outdoor air temperature circuit,

7A - Open circuit in exhaust air temperature circuit,

8A - Short circuit in exhaust air temperature circuit,

9A - Open circuit in return water temperature circuit,

10A - Short circuit in return water temperature circuit.

 

Possible causes:

  1. Supply air sensor is not connected to the controller (only for 1A/2A faults),
  2. Return water temperature sensor is not connected to the controller (only for 9A/10A faults),
  3. Sensor failure,
  4. Damaged wiring,
  5. Main controller failure.

Troubleshooting

1A/2A


 

   
Pic 1. Supply temperature sensor connection to C5 controller Pic 2.Temperature sensor characteristics

 

3A-8A

Pic 3.  Temperature sensor characteristics

9A-10A

 

   
Pic 4. Supply temperature sensor connection to C5 controller Pic 5.Temperature sensor characteristics


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