Home > Alarms > C5/C5.1 > 35A/36A/37A/38A - Return water temperature sensor failure

35A/36A/37A/38A - Return water temperature sensor failure

Alarm conditions:

35A - Open circuit in return water temperature circuit,

36A - Short circuit in return water temperature circuit,

37A - Open circuit in return water temperature circuit,

38A - Short circuit in return water temperature circuit.

Possible causes:

  1. Return water temperature sensor is not connected to the board (C5_PM),
  2. Sensor failure,
  3. Damaged wiring,
  4. C5_PM board failure.

Troubleshooting:

Pic. 1 C5_PM board connections

    Pic 2. Temperature sensor characteristics

   

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