Instruct: Classify a given review into positive or negative sentiment.
Query: Badly designed pressure switch

The pressure switch occasionally will not shut of the compressor. The only way to shut it off is to pull the electrical plug from the wall. There is no consistancy in the amount of pressure it builds. Sometimes 140 PSI and othere 165 PSI. Fifty percent of the time the safety valve blows. I called Porter Cable to send me a new one and they wouldn't. Referred me to a service center 30 miles away. I phoned the service center and they said they may not have the parts for this compressor and may have to order them. So far I am not impressed. I had a CH for 7 years without a problem. My PC is a week old.