Why Is My Senville Mini Split Indoor Unit Freezing?

Modified on Wed, 2 Apr at 12:49 PM

If your Senville mini split indoor unit is freezing up, it’s usually due to one or more of the following issues. Here's how to identify and fix the problem:

1. Low Refrigerant Levels

Cause: A refrigerant leak or undercharged system.
Symptoms: Ice buildup on the evaporator coil, reduced cooling performance.
Solution: Contact a licensed HVAC technician to check for leaks and recharge the refrigerant. DIY recharging is not recommended.

2. Dirty Air Filter or Coils

Cause: Blocked airflow from a dirty filter or clogged evaporator coils.
Symptoms: Weak airflow, freezing on coils.
Solution:
- Clean or replace the air filter.
- Gently vacuum or brush the coils. For deep cleaning, contact a service professional.

3. Fan or Blower Issues

Cause: Indoor blower not working properly or running at low speed.
Symptoms: Minimal airflow, unusual noises, ice on coils.
Solution: Have a technician inspect the fan motor or capacitor.

4. Thermostat Set Too Low

Cause: Setting the temperature too low, especially during cooler weather.
Symptoms: Freezing, even when the unit is running continuously.
Solution: Raise the temperature setting a few degrees and monitor for changes.

5. Drainage Issues or High Humidity

Cause: Blocked drain line or poor drainage.
Symptoms: Water pooling, ice formation due to trapped moisture.
Solution:
- Check and clear the drain line or pan.
- Ensure the unit is properly leveled for draining.

6. Faulty Temperature Sensor (Thermistor)

Cause: A bad or misaligned temperature sensor.
Symptoms: Unit stays on too long, freezing occurs even at moderate settings.
Solution: Contact a professional to inspect and replace the sensor if necessary.

What To Do Next

Turn off the unit and allow it to fully thaw.
Clean or replace your air filter.
Restart the unit and monitor its performance.
If freezing continues, contact a certified HVAC technician for further diagnosis.