You are confusing what I stated. A DEFECTIVE FREEZE thermistor is what I stated. I did not state your unit was freezing up. A Bad freeze thermistor will cause the system to "think" it is freezing and will shut the compressor OFF. Now, to your thinking about why in HP mode it works fine. The FREEZE thermistor does not operate in HP mode. The evap will NOT freeze since it gets HOT in HP mode. I have a test Freeze Thermister. I install and then run the system when I suspect it is caused by a bad Thermister. Takes less than 10 minutes to do this. Doug