Adam,
If you are using this unit without a reversing valve and at temps approaching freezing, you will have to provide the evaporator coil with some form of heat to thaw it out when it freezes. It sounds like your dehumidifier control is doing its job, but without any added heat the thermistor never gets warm enough to reset the control. There are a few users experiencing this bug right now, namely hv23t and ecomodded, on their hacked heaters. If you are indeed using a dehumidifier, the evap fan runs in defrost mode while the cxr does not. In this case, you can add your choice of resistive heat element and a 120V relay with the coil wired between the fan and the cxr hot wires to sense when your unit is in defrost. The relay contacts will operate the heater element and warm the evap coil. Then when the frost has melted, the thermistor will sense the warm coil and terminate defrost. This seems like the simplest, cheapest way to accomplish defrost in your situation given the info you have provided.
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