Error Code 21 — Indoor coil frosted

Was bedeutet 21 ?

The indoor unit's cooling coil has frozen over with ice. This can happen if there's not enough heat, the indoor temperature is too low, or airflow is blocked.

• Lack of heat in the conditioned space
• Operating indoor unit at excessively cold air temperatures
• Blockage of airflow to the indoor unit
• Issue with the indoor fan motor

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1. 1

   Ensure the system is set to the correct mode (heating or cooling) for the ambient conditions.

2. 2

   Check and clean the air filter of the indoor unit.

3. 3

   Verify that airflow to the indoor unit is not obstructed.

4. 4

   Allow the system to run in fan-only mode to defrost the coil, or turn the system off.

5. 5

   If the condition recurs, consult a technician.