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24A/25A/26A/27A - Evaporator sensor failure

Alarm conditions:

24A - Open circuit in evaporator air temperature sensor (B11) circuit,

25A - Short circuit in evaporator air temperature sensor (B11) circuit,

26A - Open circuit in evaporator air temperature sensor (B12) circuit,

27A - Short circuit in evaporator air temperature sensor (B12) circuit.

Possible causes:

  1. Sensor failure,
  2. Damaged wiring,
  3. Main controller failure.

Troubleshooting

 

Pic 1.  Temperature sensor characteristics

 

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