Alarm conditions:

31A - Open circuit in supply air temperature circuit (Zone 1),

32A - Short circuit in supply air temperature circuit (Zone 1),

33A  - Open circuit in supply air temperature circuit (Zone 2),

34A - Short circuit in supply air temperature circuit (Zone 2).

Possible causes:

1. Sensor not connected to C5_PM board,
2. Sensor failure,
3. Damaged wiring,
4. C5_PM board failure.

Troubleshooting:

Pic 1. C5_PM board external connections

Pic 2. Temperature sensor characteristics

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