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What Makes Air Conditioners Freeze Up

Several problems can cause an air conditioner to freeze up. Some issues may be easily resolved, while others will require the expertise of an HVAC professional. If you notice your AC unit is freezing, turn off the air conditioner and allow the ice on the coils to melt. Check your AC system for the items below. 

DIY Troubleshooting When AC Freezes Up

Blocked Air Flow – One of the most common reason for AC freezing problems is that the air flow to the system is blocked at some point. The blockage can occur at the filter, the ductwork or at the intake register. Air flow problems are generally simple to resolve. 

  1. Check Air Filters – The first step to take is to check the air filters. If the filter appears to be dirty, clean or change the filter. Sometimes, the remedy for the freezing problem is simply replacing or cleaning the air filter to improve the air flow to the system. 
  2. Check Ductwork – If the ductwork has collapsed or leaking due to damage, the air flow to your AC unit may be compromised. Check the duct system for any sign of damage that may be causing an air flow problem. 
  3. Intake Registers – Intake registers may be located on a wall or in the ceiling. If your registers are located on a wall, check to make sure that furniture or some other obstruction is not blocking the register. 

Items to be Addressed by a Professional HVAC Technician 

If you have checked for air flow problems and you still experience air conditioners freezes up, schedule a service call with your local HVAC pro. Several problems can contribute to AC freeze-up that must be addressed by an experienced professional. 

  1. Low Coolant – Air conditioners freezes up when the coolant is low. Air conditioners are sealed systems so the coolant levels will only be low if there is a leak somewhere in the unit. The HVAC pro will recharge your coolant and locate the leak. You will need to fix the leak or your AC system will soon freeze up again.
  2. Dirty Condenser or Coils – Though a handy homeowner may clean the coils and the condenser using a coil cleaning kit, most people should leave condenser and coil cleaning to the pros.
  3. Fan Problems – If the fan that distributes the air is not working properly or is not moving fast enough, the AC unit may freeze. If your fan motor has gone out, your HVAC pro will be able to replace it. If the fan is simply running too slow, your pro may be able to set the fan at a higher speed. 
  4. Faulty Thermostat – If the thermostat is not functioning properly, it can cause the air conditioner to run continuously until the condenser freezes. 

For AC freeze-up problems in Port Neches TX, call Thermacon Service Company to schedule a service call.

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