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have the gas pressure checked by an accredited ac specialist
ice forming on tubing is an indication of liquid in a low pressure line boiling off so that indicates a pressure problem
also any tubes from the outside unit to the evaporator should be insulated properly to prevent icing and loss of efficiency
inside / outside is not the problem , it is the air around the pipe that has humidity that allows the ice to form in the first place
Freezing up is caused by •dirty air filter or evaporator coil(indoor coil) •dirty blower wheel or blower fan blades •low freon •weak or slow blower motor If air filter and indoor coil are clean may be low on freon. Blower wheels seldom get dirty on window units. Pull unit from window and clean both coils with a water hose. Careful not to get any electrical wet. Let dry for a while and reinstall. If it continues to freeze its a freon problem most the time.
several issues can cause this problem.
1st. not enough air circulating the evaporator coil meaning dirt filters or obstruction.
2nd. low refrigerant charge.
3rd. the out side tempurature maybe to cold, some units don't funtion well in cold climites.
Either your coil is dirty or filter is dirty. Worst case your low on freon which would make a coil freeze.But freon doesn't evaporate if your low there must be a slow leak.
Check your air filters and replace if necessary. Check the indoor and outdoor coils and clean if needed. If the line is still is freezing get the refrigerant charge checked.
When the snowflake is blinking the thermostat in in a delay mode designed to protect your compressor. If it does not stop blinking in 15min the stat is bad otherwise something is wrong with the AC
If its in the cooling mode the ice is in both places. It freezes up inside first then works its way outside just usually not easy to see the inside ice because its incased in the coil box. This could be due to a lack of airflow ie dirty filter coil or closed dampers or low on freon. If its a heat pump and in the heating mode it could be a bad defrost control, lack of airflow across the outdoor coil or low on freon.
Wash out outside coil with hose with 30 degree downward starting at the top and work side to side to bottom and try again. If this don't help check evap coil (inside) for ice forming when unit is on. You should see a 15 - 25 degree drop from room temp coming out of discharge air. This will change with humidity indoors. as it drops temp will too.If outside coil is dirty or unit is low on gar it will cause high compressor and high disgharge lockout. Low gas can also cause freezing of indoor coil and loe temp or pressure lock out depending on type of protection incorporated.
set your unit to fan mode only, to thaw the ice, after the ice melts, look at your evaporator coil, see if its dirty, if its dirty, then you might just need a good cleaning. if the coil is clean, look at your thermostat setting. it should not be all the way cold. the compressor would run continously and it would freeze the coil. third, the refrigerant system could be partially clogged up or it lacks refrigerant. these problems initiate freezing of the coil.
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