Home > Alarms > C5/C5.1 > 39A/40A - Return water temperature too low

39A/40A - Return water temperature too low

Alarm conditions:

Return water temperature dropped below 8 oC.

Possible causes:

  1. Water pump failure,
  2. Incorrect three-way valve actuator operation,
  3. Too low hot water temperature,
  4. C5_PM board failure.

Troubleshooting:

Pic. 1 C5_PM board connections (water pump and mixing valve actuator)

 

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