I have a chiller and I believe that one of the circuits has a failed powerhead on the TXV but I am not 100% on this diagnosis.
About 2 months ago I removed the filter dryer and replaced it and charged the system to the manufacturers specs. Today I found this compressor locked out on a low pressure alarm. I reset the alarm and the compressor ran less than 5 seconds. In that time the suction pressure dropped to 25 psi (its a R22 system) and the head pressure rose to 200 psi. This leads me to think that the TXV powerhead lost its charge and is more or less working like a pump down solenoid. Am I missing something here or am I correct in my diagnosis?