Don't Panic. But Don't Ignore It
If your HVAC system has frozen up, don't panic. This is a common issue that can be caused by several factors, including restricted airflow, low refrigerant levels, or a malfunctioning blower fan.
Even though it's rare for a heat pump to freeze up, it can happen due to a variety of reasons. Some cases of freezing only require simple DIY fixes while others will need professional HVAC services.
Common Causes of a Frozen System
Here are the most common reasons your HVAC system might freeze:
- Clogged air filters. The #1 cause. Restricted airflow causes the evaporator coil to drop below freezing. Check and replace your filter every 1-3 months.
- Low refrigerant. If your system is low on refrigerant, it could indicate a leak that needs professional attention. Don't try to add refrigerant yourself.
- Faulty blower fan. If the fan isn't circulating air properly, the coil temperature drops and ice forms.
- Dirty evaporator coils. Built-up dirt insulates the coil and prevents proper heat absorption.
- Thermostat issues. Running your AC when outdoor temps are too low can cause freezing.
What to Do Right Now
If you find your system frozen, turn it off immediately and let it thaw completely before restarting. Switch the fan to 'ON' (not 'AUTO') to help circulate warm air over the coils. Check your air filter, if it's dirty, replace it.
If the problem persists after thawing and a fresh filter, contact First Class Heating & Air at (864) 362-6255 to diagnose the root cause. Continuing to run a system that repeatedly freezes can cause serious compressor damage.
