In cold and humid weather, it is normal for defrosting to occur more frequently. However, excessively frequent defrosting can significantly reduce efficiency.
Normal conditions
Temperatures slightly above or below freezing with high humidity are among the most demanding conditions for icing.
Potential causes for excessive defrosting
Dirty outdoor heat exchanger, restricted airflow, faulty sensor, or incorrect control parameters.
What to monitor
Defrost frequency, duration, outdoor air temperature, coil temperature, and runtime between two cycles.
Correct diagnosis
Evaluation should be based on the manual and actual trends, not just the visual presence of ice.
