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AC Question: What Causes Icing On My AC?


There are a number of reasons why your Tampa air conditioner may be icing up.  Here are some of the most common that the air conditioning experts at Ierna’s Heating and Cooling have put together for you:

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  • Evaporator Fan Malfunction:  If the evaporator fan fails it could be due to an obstruction that is keeping it from rotating, or a broken wire could have disconnected the evaporator fan from the thermostat.  Either could cause air conditioning frost build-up to occur.
  • Decreased Air Flow:  Without proper air circulation an AC will begin to ice up quickly around the condenser or evaporator coils.  This could be the result of a blocked return duct vent, dirty air filters or dirty, blocked coils.  Whatever the culprit, a decrease in air flow will cause the AC to work overtime, resulting in frost buildup.
  • Unreasonable Thermostat Settings:  If a thermostat is set to a temperature that is too low it can cause the AC to work continually without ever reaching that desired temperature.  Generally air conditioners can only work up to a twenty degree temperature difference from outside air, so if your AC is set to 70 while the temp outside is 100, you’ll never reach the desired temperature.
  • Blower Failure:  Blowers that fail completely or which run at the wrong speed can cause AC icing to occur.
  • Low Refrigerant Levels or Charge:  Having too little refrigerant charge can cause air conditioning frost build-up to occur.  It could be that the AC has been running for too long without a break which has caused refrigerant levels to decrease, or that there is a slow leak in the refrigerant line which needs to be fixed.

Let the Tampa AC specialists at Ierna’s Heating and Cooling determine the cause of icing on your AC so that we can perform a proper repair and get your air conditioner back in efficient working order once again.  Contact us today and receive quality workmanship with professionals who know all about AC icing.