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:
- Sensor not connected to C5_PM board,
- Sensor failure,
- Damaged wiring,
- C5_PM board failure.
Troubleshooting:
Pic 1. C5_PM board external connections
Pic 2. Temperature sensor characteristics
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