The following are reasons unit would ice.
1.Slightly low on refrigerant
2.Restricionin the refrigerant circuit (kink, metering device, filer drier)
3.Low or no air flow across indoor coil.
Since unit was cooling fine until yesterday I do not suspect low on refrigerant or a restriction.The fact that fan on inside does not come on narrows it down to either the fan being defective or the control board not telling it to come on.
Either of those two should cost around 300 to 400 if unit is out of warranty.
If you have further questions, please let me know.
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