Question about Friedrich M18CF Split System Air Conditioner

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Friedrich air conditioning - inside unit ice build up

I own a Friedrich air conditioning system with an external and internal unit. The system works well, but after 2 or 3 days of use, the internal fan blowing the cold air starts to make a rattling noise due to ice build up which gets in its way. After I shut off the system, the inside unit drips as the ice build up melts. I have cleaned the filters and this is not the problem. Please advise what would cause such a problem and potential solutions? Thank you.

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Hi, Reduced air flow, low on freon or being continuously run during cooler weather such as at night. Some people turn their thermostat on 60 thinking that it will help get it cooler faster. They freeze up at night and don't get a chance to thaw during the day. It needs set no lower than 75 or so. The evaporator may be dirty. Don't know a lot about your particular unit but if the outside unit has the compressor and refrigerant lines running to it, The large refrigerant line should sweat all the way to the compressor if its fully charged. Please rate me if I have helped. Good luck kstfas

Posted on Aug 28, 2007

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You may have blocked a return vent with furniture or something if so pull it away from the wall a little bit but you have to let it thaw all the way out before you turn it back on

Posted on Jan 07, 2014

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1.Improper airflow (dirty filter,faulty blower fan, closed or blocked registers,etc)
2.Low refrigerant charge (possible leak)
3.Restricted liquid line (kinked)
4.Clogged filter/drier
Can all cause freezing of the evaporator (indoor coil)

Posted on Aug 22, 2013

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