su2skelsey 0 Report post Posted July 21, 2019 If anyone gets a HPF error code on their A/C unit and the sea strainer is clear, try priming the pump. I recently had my boat pulled to get the throttle cable fixed and lost prime on the A/C unit which cause a HPF error on my A/C unit. This is a Marine Air System. On the dock I used the water hose and went to the water discharge thru hull and sprayed water into the thru hole for a minute. Went back to inside of the boat, turned the A/C unit and viola. I hope this helps someone. Share this post Link to post Share on other sites