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:
- Fan failure,
- Too high resistance in duct system,
- Airflow is measured incorrectly,
- Controller failure
Troubleshooting:
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