A heatpump is used to cool a home in Florida. A relative noticed that the temperature was 90 degrees and that the evaporator (see photo) was sweating. She thinks she heard a piece of ice fall break off inside the evaporator. The unit was installed in 2016.
What causes a heatpump to freeze when used in cooling mode?
- Poor airflow from a dirty airfilter?
- Low freon pressure?
The power to the heatpump has been disconnected to ensure that any ice melts.
Is the most likely culprit the AC filter? Any diagnostic instructions are appreciated.