pressure switch?

[Bob]

My EC12 powers all the way up until it pressure releases and then starts to build pressure again. It keeps doing it until it finally stalls and blows a breaker. Is this a pressure switch?

[362004]

My ec12 powers all the way up until it pressure releases (shuts off) and the safety valve blows. It then starts to build pressure again and then repeats the process. Sometimes I snap the ring on the safety valve and it will hold the air.