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F7 - Heat exchanger failure

Alarm conditions:

Heat exchanger efficiency dropped below 50%.

Possible causes:

  1. Broken rotor belt,
  2. Rotor motor failure,
  3. Rotor motor control board failure (R2_1),
  4. Temperature sensor failure,
  5. Main controller failure.


Units with rotory heat exchanger

Units with plate heat exchanger


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