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21A/22A/23A - Electrical heater overheating

Alarm conditions:

21A - Activated heater TK100 overheating protection

22A - Activated heater TK100 (ZONE 1) overheating protection

23A - Activated heater TK100 (ZONE 2) overheating protection

Possible causes:

  1. Fan failure,
  2. Too high resistance in duct system,
  3. Airflow is measured incorrectly,
  4. Controller failure

Troubleshooting:

 

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