The top of the stack is putting out mosture fhat runs down the outside of the stack ,that causes a huge ice build up on stack and roof this is a 1995 mobile home with a shingled roof it belongs to a elderdy lady who keeps her inside temp at 80 degrees she is very cercerned about this problem , She lives in Milan Illonios.
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If the unit is running in cold weather than there is ice building up on the coils located outside. This is normal in that the unit is running in heat pump mode heating inside and cooling outside, After the unit detects the ice build up it briefly reverses the cycle heating the outside coils melting(defrosting) the ice which you observe as water on the pad.
System needs to be thawed out, so turn it off before something else breaks, cause pipes are probably plugged and stopping any movement inside the system, Try using a blow dryer on high heat to help with the thaw out of the pipes with the ice build-up , then leave it off for a couple of hours and then try to turn it on again see if the unit in the house is running or blowing cold air again. Turn it on HIGH...!!!!
Some heat pumps have high and low pressure swiches installed to keep compressor from running when unsafe conditions occur that can damage the compressor. If the outside fan is not turing on, the unit is cycling on high pressure, if you see ice forming on the big refrigerant line coming from the air handler, then the compressor is shutting down on low pressure. Low pressure can be cause by lack of air flow through air handler or from a low refrigerant charge.
On the split system 1. Can burnout from defect, lightening, etc .. 2. Only way ice will buildup back to outside unit is LOW LOAD.. either from dirty filter, dirty coil or fan blades caked up with dirt. 3.. Poor airflow will cause the poor cooling $ Outdoor unit most likely has a low pressure switch causing the outside unit to shutoff until pressure rises.. Has this helped ?
As with the simplest way to thaw ice is with heat.
If you are running this unit in cooling and have ice outside, then you most likely have a freeze up inside as well. If this is a heat pump unit, then frost is normal during operation, however, ice build-up is an indication of a problem.
There are 2 effective ways to remove the ice build-up. The first is the simplest. Get your water hose and hose it down. Be sure to turn off the breakers to the unit and avoid spraying the electrical compartment. If you have the ability to hook the hose into a hot water line, then this process with be extremely fast. Let the unit sit for about 20 minutes to dry out and turn it back on.
The second can be a little more complicated if your not tech savoy. You can turn the system on in the cooling mode. This will make the outdoor coil the condenser section. Then, either block the airflow through the coils with an object, put an object over the fan to increase pressure, or if you can, disconnect the fan so it does not run. This method is essentially the same as a defrost cycle.
As with any failure, you can fix the problem at hand, but it will return. After you get past this, your real challenge will be determining what caused the freeze-up.
If you were running your system in cooling already, then you will need to ensure the system has de-iced on the inside as well.
you have a clogged condensation drain. Easiest repair is to find where the drain exits the house usually by the outside a/c unit. It will be a white pvc pipe that is sticking out of the side of the house. If this is found you can use a wet/dry vac and place it on the end of this pipe and evacuate the water and debris from there. If the pipe isn't found you need to go to the furnance and find the white pvc pie coming out from the furnance and using a pvc cutter cut the pipe at that point and use the wet/dry vac at that point. Make sure you vacumm out both directions since you dont know where the blockage is. To repair the cut pipe use a pvc collar and you will not need to glue this collar back since there isn't any pressure in the pipe and it can be used again should you have the same problem later. Go to a neighborhood home repair shop and explain what you need to do and they will assist you with parts and instructions. Good luck on your repairs hope this helped
three possible prolems here 1 check the evaporator coil and filter to see if they are dirty and need to be cleaned dirt gets into the coil by by-passing the filter or the filter is no longer able to contain the dirt. 2 if there is a opening in your furnace that allows air to the furnance without going through the return air vent this could be a cause 3 low on freon in which a tech will be needed to check. Also check the outside unit and see if the coils have a lot of debris on them if so you can use a garden hose to clean them but make sure to have the power off and just spray the coils nothing else. Good luck