Common Causes
- Restricted airflow from a dirty filter, closed vents, or a blocked return
- Low refrigerant charge
- A dirty evaporator coil
- A failing blower motor or fan
- Running the system at very low thermostat settings for extended periods
- Running the AC when outdoor temperatures are unusually low
What You Can Safely Check
- Turn the system OFF completely (not just raised in temperature) and set the fan to "On" or off so the ice can fully thaw — this can take several hours
- Once thawed, check and replace the air filter if it is dirty
- Confirm vents throughout the home are open
When to Call NILOV
- After the coil has fully thawed, before restarting the system if you are unsure it is safe to do so
- The coil refreezes once the system runs again
- You are not comfortable waiting out a full thaw cycle on your own