Central ac coil pipe had frost unit wasn't cooling house. The filter was very dirty replaced the filter. Called place that installed. They couldn't find anything then they said nit was the valve that controlled tar freon. Since the unit is 3 yrs old they said rheum shoal replace it. Well now they say they can't get the part and we need to buy new coil system it's only3 yrs old. We turned the unit on for 2 hrs and no frost what should we do

Your furnace filter or A/C filter is located next to the floor in your cold air return into the furnace. Your other problem is your condensate line out of the A/C box that sits on top of your furnace is plugged. Replace your filter in the cold air duct, and remove your condensate line from the A/C box and blow air in the line to remove the clog in the line.

either the inside coil is dirty or system is overcharged.

have you removeing the filter from the front of it sometimes colecting all that dust in it can cause it send only luke warm air out also if youve had it on none stop it can sometimes freeze but then letting it sit for a couple hours to a day usually solves that

Hello, sounds like it is either a low charge or lack of airflow, what type of filter are you using? sometimes those filters that claim to be super effecient will actually cut down on your airflow and cause the ac to freeze up.

Generally, the fuses are located in a box outside by the outdoor unit. The box has a door on it and you will probably have to pull a cartridge out and the fuses will be behind the cartridge. If you don't have an ohm meter to check the fuses , just go to home depot, lowes or another hardware store where they can check them for you. Be sure to check the circuit breakers too.

The frost on the pipe indicates you have a dirty filter, dirty evaporator coil, Blower not running at the proper speed (to slow) or you are low on refrigerant.

Turn off your A/C and put your fan switch in ON or FAN. Run the fan only for approx 3 hours. Check your air filter and clean/replace as necessary. Also check your evaporator coil and clean if necessary. It is possible that your evaporator coil is frozen up from a dirty filter or coil. If it continues to be a problem, you probably have a refrigerant problem which will require a certified service technician to address. Try taking care of the filter and coil first. :-)

soundls like the condensate drain is clogged and coil is dirty. look for a plastic pipe inlet where water would flow to.. you may be able to clear it by blowing it out with compressed air. you can also pour bleach into it to address the mold problem. if the coil is icing up it is because it is dirty. to verify this, let the unit run in ac mode for about an hour and check to see if you have air flow from the vents. if you do not, then the cooling coil is covered in ice, thus blocking air flow. you should have a qualified ac person clean the coil and check the refrigerant charge on the unit. one thing to consider, change your ac filter often, at least once a month in hot weather.

when lines are frosted you have an air flow problem ie dirty filter or blocked return air grill, fan problem or its low on refrigerant

Reduced or no airflow, Evaporator may be dirty. Low on freon.