The outdoor fan is critical for heat transfer in the outdoor heat exchanger.
Symptoms
High pressure alarm, rapid icing, noise, vibrations, or low performance may be related to insufficient airflow.
EC/DC motor
In modern units, the motor is electronically controlled and may feature speed feedback.
What to check
Power supply, command signal, feedback, free rotation of the fan blade, and the condition of the blades.
Caution
The fan may stop normally during defrost, therefore diagnosis should always be performed during the correct operating phase.
