Alarm conditions:

Return water temperature dropped below 8 ^oC.

Possible causes:

1. Return water temperature failure,
2. Wiring failure,
3. Water pump failure,
4. Incorrect three-way valve actuator operation,
5. Too low hot water temperature,
6. Main controller failure.

Troubleshooting

Pic 1. Sensor resistance characteristics

Pic 2. Water heating/cooling box connection terminals

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