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27B - Low return water temperature

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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