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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