If you have lost airflow and your thermostat temperature is going up instead of down, you have a problem! After the loss of airflow and temperature not dropping, the next suspect to a frozen evaporator coil would be water around the bottom of the furnace. This is due to the ice on the coil melting when the condenser shuts down on pressure safety and the condensate drain can’t keep up. This results in water overflowing around the sides of the coil and running down the furnace to the blower box and finally out the bottom.
Blocked air filter
If this is the case, you should turn the ac off and the fan setting to the on position. You will need a lot of towels handy to place around the furnace to help absorb the water that runs to the floor. Once the ice is melted and the floor dries up, put a fresh, clean, and dry filter back in and turn the ac on and keep your fingers crossed that you didn’t damage the condensing unit!
If your filter was not dirty, there are a couple of other reasons why you may have a frozen coil. The most common after a dirty filter is that your system could be low on refrigerant. If your filter is clean and your blower motor is running, this is likely your unfortunate issue. If you suspect this, call a service company off our list to find out where your unit is leaking from and repair it. The next most common cause of a frozen coil is a bad blower motor. This happens because the a/c unit relies on the warm return air from your home to transfer the heat to the coil and deliver cool-feeling, de-humidified air to your home. Without that warmer air passing through the coil, it will rapidly freeze up.
