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drain tube runs from dead center of the coil into the back wall and down under the unit where it drains into a pan and is evaporated. Sounds like just a blocked drain tube. The easiest way to clear this is to take the bottom front grill off and look for the drain tube which is typically just strapped to the top of the opening suspended over the pan. Use a wet vac to pull out the sludge or some kind of pressure to blow it back up into the cabinet. Problem with blowing back is that dirt and water are going to blow into the cabinet and/or coil. taking the hose off of the interior coil is difficult and you can break the plastic connector so I don't recommend that to anyone.
Could be a number of things. It has a thermistor that sits on the evaporator to keep the fan off until it gets cold. It also has a switch above the door that switches the fan on when the door's closed. It could be a loose connection in the wiring, or, lastly, it could be a seized fan
Try defrosting the unit by shutting it down until all ice is gone. If this corrects the problem and the ice returns you may either have a defrosting problem or a low freon charge.
in many cases, these units have relays or contactors where the contact points actually weld together. this causes the unit to stay running even though power to the coil has been stopped. I'd start looking there first. don't over look the possibility that someone could have mistakenly miswired the unit.
Your unit should have a defrost timer.The timer may be stuck in a defrost.It should be located at the bottom of the unit next to the compressor.Open the door to the timer and observe the position of the timer.If you turn the knob and the unit starts up,it's the timer. If this is the case, you can purchase a new one at any local a/c supply.Let me know,Mike
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